diff --git a/package.json b/package.json
index ad4c9ac..2172e4d 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "greenkeeper-lockfile": "1.15.1"
   },
   "devDependencies": {
-    "node-dev": "^3.1.3",
+    "node-dev": "^4.0.0",
     "nodemon": "^1.18.3"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 460b887..103d48b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -27,20 +27,12 @@ ansi-regex@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-3.0.0.tgz#ed0317c322064f79466c02966bddb605ab37d998"
 
-ansi-styles@^2.2.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
-
 ansi-styles@^3.2.1:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
   dependencies:
     color-convert "^1.9.0"
 
-ansicolors@~0.2.1:
-  version "0.2.1"
-  resolved "https://registry.yarnpkg.com/ansicolors/-/ansicolors-0.2.1.tgz#be089599097b74a5c9c4a84a0cdbcdb62bd87aef"
-
 anymatch@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/anymatch/-/anymatch-2.0.0.tgz#bcb24b4f37934d9aa7ac17b4adaf89e7c76ef2eb"
@@ -220,23 +212,6 @@ capture-stack-trace@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/capture-stack-trace/-/capture-stack-trace-1.0.0.tgz#4a6fa07399c26bba47f0b2496b4d0fb408c5550d"
 
-cardinal@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/cardinal/-/cardinal-1.0.0.tgz#50e21c1b0aa37729f9377def196b5a9cec932ee9"
-  dependencies:
-    ansicolors "~0.2.1"
-    redeyed "~1.0.0"
-
-chalk@^1.1.3:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
-  dependencies:
-    ansi-styles "^2.2.1"
-    escape-string-regexp "^1.0.2"
-    has-ansi "^2.0.0"
-    strip-ansi "^3.0.0"
-    supports-color "^2.0.0"
-
 chalk@^2.0.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
@@ -285,19 +260,6 @@ cli-boxes@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/cli-boxes/-/cli-boxes-1.0.0.tgz#4fa917c3e59c94a004cd61f8ee509da651687143"
 
-cli-table@^0.3.1:
-  version "0.3.1"
-  resolved "https://registry.yarnpkg.com/cli-table/-/cli-table-0.3.1.tgz#f53b05266a8b1a0b934b3d0821e6e2dc5914ae23"
-  dependencies:
-    colors "1.0.3"
-
-cli-usage@^0.1.1:
-  version "0.1.7"
-  resolved "https://registry.yarnpkg.com/cli-usage/-/cli-usage-0.1.7.tgz#eaf1c9d5b91e22482333072a12127f05cd99a3ba"
-  dependencies:
-    marked "^0.3.12"
-    marked-terminal "^2.0.0"
-
 code-point-at@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/code-point-at/-/code-point-at-1.1.0.tgz#0d070b4d043a5bea33a2f1a40e2edb3d9a4ccf77"
@@ -319,10 +281,6 @@ color-name@1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.1.tgz#4b1415304cf50028ea81643643bd82ea05803689"
 
-colors@1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/colors/-/colors-1.0.3.tgz#0433f44d809680fdeb60ed260f1b0c262e82a40b"
-
 component-emitter@^1.2.1:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/component-emitter/-/component-emitter-1.2.1.tgz#137918d6d78283f7df7a6b7c5a63e140e69425e6"
@@ -482,11 +440,12 @@ duplexer@~0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/duplexer/-/duplexer-0.1.1.tgz#ace6ff808c1ce66b57d1ebf97977acb02334cfc1"
 
-dynamic-dedupe@^0.2.0:
-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/dynamic-dedupe/-/dynamic-dedupe-0.2.0.tgz#50f7c28684831ecf1c170aab67a1d5311cdd76ce"
+dynamic-dedupe@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/dynamic-dedupe/-/dynamic-dedupe-0.3.0.tgz#06e44c223f5e4e94d78ef9db23a6515ce2f962a1"
+  integrity sha1-BuRMIj9eTpTXjvnbI6ZRXOL5YqE=
   dependencies:
-    xtend "~2.0.6"
+    xtend "^4.0.0"
 
 ee-first@1.1.1:
   version "1.1.1"
@@ -506,14 +465,10 @@ escape-html@~1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/escape-html/-/escape-html-1.0.3.tgz#0258eae4d3d0c0974de1c169188ef0051d1d1988"
 
-escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.5:
+escape-string-regexp@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
 
-esprima@~3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/esprima/-/esprima-3.0.0.tgz#53cf247acda77313e551c3aa2e73342d3fb4f7d9"
-
 etag@~1.8.1:
   version "1.8.1"
   resolved "https://registry.yarnpkg.com/etag/-/etag-1.8.1.tgz#41ae2eeb65efa62268aebfea83ac7d79299b0887"
@@ -653,10 +608,6 @@ for-in@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/for-in/-/for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"
 
-foreach@~2.0.1:
-  version "2.0.5"
-  resolved "https://registry.yarnpkg.com/foreach/-/foreach-2.0.5.tgz#0bee005018aeb260d0a3af3ae658dd0136ec1b99"
-
 forwarded@~0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/forwarded/-/forwarded-0.1.2.tgz#98c23dab1175657b8c0573e8ceccd91b0ff18c84"
@@ -769,15 +720,10 @@ greenkeeper-lockfile@1.15.1:
     require-relative "^0.8.7"
     semver "^5.3.0"
 
-growly@^1.2.0:
+growly@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/growly/-/growly-1.3.0.tgz#f10748cbe76af964b7c96c93c6bcc28af120c081"
-
-has-ansi@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/has-ansi/-/has-ansi-2.0.0.tgz#34f5049ce1ecdf2b0649af3ef24e45ed35416d91"
-  dependencies:
-    ansi-regex "^2.0.0"
+  integrity sha1-8QdIy+dq+WS3yWyTxrzCivEgwIE=
 
 has-flag@^3.0.0:
   version "3.0.0"
@@ -870,10 +816,6 @@ indent-string@^2.1.0:
   dependencies:
     repeating "^2.0.0"
 
-indexof@~0.0.1:
-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/indexof/-/indexof-0.0.1.tgz#82dc336d232b9062179d05ab3293a66059fd435d"
-
 inflight@^1.0.4:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/inflight/-/inflight-1.0.6.tgz#49bd6331d7d02d0c09bc910a1075ba8165b56df9"
@@ -1022,10 +964,6 @@ is-obj@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-obj/-/is-obj-1.0.1.tgz#3e4729ac1f5fde025cd7d83a896dab9f4f67db0f"
 
-is-object@~0.1.2:
-  version "0.1.2"
-  resolved "https://registry.yarnpkg.com/is-object/-/is-object-0.1.2.tgz#00efbc08816c33cfc4ac8251d132e10dc65098d7"
-
 is-path-inside@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-path-inside/-/is-path-inside-1.0.1.tgz#8ef5b7de50437a3fdca6b4e865ef7aa55cb48036"
@@ -1058,9 +996,10 @@ is-windows@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.2.tgz#d1850eb9791ecd18e6182ce12a30f396634bb19d"
 
-is@~0.2.6:
-  version "0.2.7"
-  resolved "https://registry.yarnpkg.com/is/-/is-0.2.7.tgz#3b34a2c48f359972f35042849193ae7264b63562"
+is-wsl@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-wsl/-/is-wsl-1.1.0.tgz#1f16e4aa22b04d1336b66188a66af3c600c3a66d"
+  integrity sha1-HxbkqiKwTRM2tmGIpmrzxgDDpm0=
 
 isarray@1.0.0, isarray@~1.0.0:
   version "1.0.0"
@@ -1116,83 +1055,10 @@ load-json-file@^1.0.0:
     pinkie-promise "^2.0.0"
     strip-bom "^2.0.0"
 
-lodash._arraycopy@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/lodash._arraycopy/-/lodash._arraycopy-3.0.0.tgz#76e7b7c1f1fb92547374878a562ed06a3e50f6e1"
-
-lodash._arrayeach@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/lodash._arrayeach/-/lodash._arrayeach-3.0.0.tgz#bab156b2a90d3f1bbd5c653403349e5e5933ef9e"
-
-lodash._baseassign@^3.0.0:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/lodash._baseassign/-/lodash._baseassign-3.2.0.tgz#8c38a099500f215ad09e59f1722fd0c52bfe0a4e"
-  dependencies:
-    lodash._basecopy "^3.0.0"
-    lodash.keys "^3.0.0"
-
-lodash._baseclone@^3.0.0:
-  version "3.3.0"
-  resolved "https://registry.yarnpkg.com/lodash._baseclone/-/lodash._baseclone-3.3.0.tgz#303519bf6393fe7e42f34d8b630ef7794e3542b7"
-  dependencies:
-    lodash._arraycopy "^3.0.0"
-    lodash._arrayeach "^3.0.0"
-    lodash._baseassign "^3.0.0"
-    lodash._basefor "^3.0.0"
-    lodash.isarray "^3.0.0"
-    lodash.keys "^3.0.0"
-
-lodash._basecopy@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/lodash._basecopy/-/lodash._basecopy-3.0.1.tgz#8da0e6a876cf344c0ad8a54882111dd3c5c7ca36"
-
-lodash._basefor@^3.0.0:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/lodash._basefor/-/lodash._basefor-3.0.3.tgz#7550b4e9218ef09fad24343b612021c79b4c20c2"
-
-lodash._bindcallback@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/lodash._bindcallback/-/lodash._bindcallback-3.0.1.tgz#e531c27644cf8b57a99e17ed95b35c748789392e"
-
-lodash._getnative@^3.0.0:
-  version "3.9.1"
-  resolved "https://registry.yarnpkg.com/lodash._getnative/-/lodash._getnative-3.9.1.tgz#570bc7dede46d61cdcde687d65d3eecbaa3aaff5"
-
-lodash.assign@^4.2.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/lodash.assign/-/lodash.assign-4.2.0.tgz#0d99f3ccd7a6d261d19bdaeb9245005d285808e7"
-
-lodash.clonedeep@^3.0.0:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/lodash.clonedeep/-/lodash.clonedeep-3.0.2.tgz#a0a1e40d82a5ea89ff5b147b8444ed63d92827db"
-  dependencies:
-    lodash._baseclone "^3.0.0"
-    lodash._bindcallback "^3.0.0"
-
 lodash.debounce@^4.0.8:
   version "4.0.8"
   resolved "https://registry.yarnpkg.com/lodash.debounce/-/lodash.debounce-4.0.8.tgz#82d79bff30a67c4005ffd5e2515300ad9ca4d7af"
 
-lodash.isarguments@^3.0.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/lodash.isarguments/-/lodash.isarguments-3.1.0.tgz#2f573d85c6a24289ff00663b491c1d338ff3458a"
-
-lodash.isarray@^3.0.0:
-  version "3.0.4"
-  resolved "https://registry.yarnpkg.com/lodash.isarray/-/lodash.isarray-3.0.4.tgz#79e4eb88c36a8122af86f844aa9bcd851b5fbb55"
-
-lodash.keys@^3.0.0:
-  version "3.1.2"
-  resolved "https://registry.yarnpkg.com/lodash.keys/-/lodash.keys-3.1.2.tgz#4dbc0472b156be50a0b286855d1bd0b0c656098a"
-  dependencies:
-    lodash._getnative "^3.0.0"
-    lodash.isarguments "^3.0.0"
-    lodash.isarray "^3.0.0"
-
-lodash.toarray@^4.4.0:
-  version "4.4.0"
-  resolved "https://registry.yarnpkg.com/lodash.toarray/-/lodash.toarray-4.4.0.tgz#24c4bfcd6b2fba38bfd0594db1179d8e9b656561"
-
 lodash@^4.17.4:
   version "4.17.10"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
@@ -1239,20 +1105,6 @@ map-visit@^1.0.0:
   dependencies:
     object-visit "^1.0.0"
 
-marked-terminal@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/marked-terminal/-/marked-terminal-2.0.0.tgz#5eaf568be66f686541afa52a558280310a31de2d"
-  dependencies:
-    cardinal "^1.0.0"
-    chalk "^1.1.3"
-    cli-table "^0.3.1"
-    lodash.assign "^4.2.0"
-    node-emoji "^1.4.1"
-
-marked@^0.3.12:
-  version "0.3.19"
-  resolved "https://registry.yarnpkg.com/marked/-/marked-0.3.19.tgz#5d47f709c4c9fc3c216b6d46127280f40b39d790"
-
 media-typer@0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/media-typer/-/media-typer-0.3.0.tgz#8710d7af0aa626f8fffa1ce00168545263255748"
@@ -1322,7 +1174,7 @@ minimist@0.0.8:
   version "0.0.8"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
 
-minimist@^1.1.1, minimist@^1.1.3, minimist@^1.2.0:
+minimist@^1.1.3, minimist@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
 
@@ -1388,34 +1240,28 @@ negotiator@0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.1.tgz#2b327184e8992101177b28563fb5e7102acd0ca9"
 
-node-dev@^3.1.3:
-  version "3.1.3"
-  resolved "https://registry.yarnpkg.com/node-dev/-/node-dev-3.1.3.tgz#582719223ebdef5d63059e6a7fbcd2399fc0f84d"
+node-dev@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/node-dev/-/node-dev-4.0.0.tgz#c03a492c517ed3153693f9082e46c304c522a48d"
+  integrity sha512-XwaUAv2bb7Y9bhCT8dsel5XquRQczG5z4QYhh2otdUMuhRAgtDjFxZEKK4Tsa57vL2ye8ojfLIAZOTBx+Ui9zw==
   dependencies:
     dateformat "~1.0.4-1.2.3"
-    dynamic-dedupe "^0.2.0"
+    dynamic-dedupe "^0.3.0"
     filewatcher "~3.0.0"
     minimist "^1.1.3"
-    node-notifier "^4.0.2"
+    node-notifier "^5.4.0"
     resolve "^1.0.0"
 
-node-emoji@^1.4.1:
-  version "1.8.1"
-  resolved "https://registry.yarnpkg.com/node-emoji/-/node-emoji-1.8.1.tgz#6eec6bfb07421e2148c75c6bba72421f8530a826"
-  dependencies:
-    lodash.toarray "^4.4.0"
-
-node-notifier@^4.0.2:
-  version "4.6.1"
-  resolved "https://registry.yarnpkg.com/node-notifier/-/node-notifier-4.6.1.tgz#056d14244f3dcc1ceadfe68af9cff0c5473a33f3"
+node-notifier@^5.4.0:
+  version "5.4.0"
+  resolved "https://registry.yarnpkg.com/node-notifier/-/node-notifier-5.4.0.tgz#7b455fdce9f7de0c63538297354f3db468426e6a"
+  integrity sha512-SUDEb+o71XR5lXSTyivXd9J7fCloE3SyP4lSgt3lU2oSANiox+SxlNRGPjDKrwU1YN3ix2KN/VGGCg0t01rttQ==
   dependencies:
-    cli-usage "^0.1.1"
-    growly "^1.2.0"
-    lodash.clonedeep "^3.0.0"
-    minimist "^1.1.1"
-    semver "^5.1.0"
-    shellwords "^0.1.0"
-    which "^1.0.5"
+    growly "^1.3.0"
+    is-wsl "^1.1.0"
+    semver "^5.5.0"
+    shellwords "^0.1.1"
+    which "^1.3.0"
 
 node-pre-gyp@^0.10.0:
   version "0.10.3"
@@ -1517,14 +1363,6 @@ object-copy@^0.1.0:
     define-property "^0.2.5"
     kind-of "^3.0.3"
 
-object-keys@~0.2.0:
-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/object-keys/-/object-keys-0.2.0.tgz#cddec02998b091be42bf1035ae32e49f1cb6ea67"
-  dependencies:
-    foreach "~2.0.1"
-    indexof "~0.0.1"
-    is "~0.2.6"
-
 object-visit@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/object-visit/-/object-visit-1.0.1.tgz#f79c4493af0c5377b59fe39d395e41042dd045bb"
@@ -1770,12 +1608,6 @@ redent@^1.0.0:
     indent-string "^2.1.0"
     strip-indent "^1.0.1"
 
-redeyed@~1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/redeyed/-/redeyed-1.0.1.tgz#e96c193b40c0816b00aec842698e61185e55498a"
-  dependencies:
-    esprima "~3.0.0"
-
 regex-not@^1.0.0, regex-not@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/regex-not/-/regex-not-1.0.2.tgz#1f4ece27e00b0b65e0247a6810e6a85d83a5752c"
@@ -1941,9 +1773,10 @@ shebang-regex@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-1.0.0.tgz#da42f49740c0b42db2ca9728571cb190c98efea3"
 
-shellwords@^0.1.0:
+shellwords@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/shellwords/-/shellwords-0.1.1.tgz#d6b9181c1a48d397324c84871efbcfc73fc0654b"
+  integrity sha512-vFwSUfQvqybiICwZY5+DAWIPLKsWO31Q91JSKl3UYv+K5c2QRPzn0qzec6QPu1Qc9eHYItiP3NdJqNVqetYAww==
 
 signal-exit@^3.0.0, signal-exit@^3.0.2:
   version "3.0.2"
@@ -2102,10 +1935,6 @@ strip-json-comments@~2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
 
-supports-color@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"
-
 supports-color@^5.2.0, supports-color@^5.3.0:
   version "5.4.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.4.0.tgz#1c6b337402c2137605efe19f10fec390f6faab54"
@@ -2265,9 +2094,10 @@ vary@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/vary/-/vary-1.1.2.tgz#2299f02c6ded30d4a5961b0b9f74524a18f634fc"
 
-which@^1.0.5, which@^1.2.9:
+which@^1.2.9, which@^1.3.0:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/which/-/which-1.3.1.tgz#a45043d54f5805316da8d62f9f50918d3da70b0a"
+  integrity sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==
   dependencies:
     isexe "^2.0.0"
 
@@ -2299,12 +2129,10 @@ xdg-basedir@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-3.0.0.tgz#496b2cc109eca8dbacfe2dc72b603c17c5870ad4"
 
-xtend@~2.0.6:
-  version "2.0.6"
-  resolved "https://registry.yarnpkg.com/xtend/-/xtend-2.0.6.tgz#5ea657a6dba447069c2e59c58a1138cb0c5e6cee"
-  dependencies:
-    is-object "~0.1.2"
-    object-keys "~0.2.0"
+xtend@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
+  integrity sha1-pcbVMr5lbiPbgg77lDofBJmNY68=
 
 yallist@^2.1.2:
   version "2.1.2"