Merge pull request #10 from aubrey-y/issue-9

fixed Travis build

Author: bnasslahsen

.travis.yml

@@ -2,5 +2,5 @@ language: ruby
 cache: bundler
 rvm: 2.6
 
-install: script/bootstrap
-script: script/cibuild
+install: bash script/bootstrap
+script: bash script/cibuild