prepare release 4.2.2

Author: mpv1989

ChangeLog

@@ -1,4 +1,4 @@
-v4.2.2 (xxxx-xx-xx)
+v4.2.2 (2017-07-20)
 ---------------------------
 * added ArangoDatabaseAsync.grantAccess(String, Permissions)
 * added ArangoCollectionAsync.grantAccess(String, Permissions)
@@ -9,6 +9,7 @@ v4.2.2 (xxxx-xx-xx)
 * added ArangoDatabaseAsync.updateUserDefaultCollectionAccess(String, Permissions)
 * added ArangoCollectionAsync.getDocuments(Collection<String>, Class)
 * added connection/handshake retry on same host
+* added deduplicate field for hash/skiplist index
 
 v4.2.1 (2017-06-20)
 ---------------------------

pom.xml

@@ -4,7 +4,7 @@
 
 	<groupId>com.arangodb</groupId>
 	<artifactId>arangodb-java-driver-async</artifactId>
-	<version>4.2.2-SNAPSHOT</version>
+	<version>4.2.2</version>
 	<inceptionYear>2016</inceptionYear>
 	<packaging>jar</packaging>