prepare release 4.2.0

Author: mpv1989

ChangeLog

@@ -1,7 +1,13 @@
-v4.2.0 (2017-xx-xx)
+v4.2.0 (2017-06-14)
 ---------------------------
 * added ArangoDBVersion.getLicense()
 * added ArangoDB.getRole()
+* added ArangoDBException.getException()
+* updated velocypack-module-jdk8
+  * added support for deserializing null values into Optional.empty()
+  * added support for deserializing null values into OptionalDouble.empty()
+  * added support for deserializing null values into OptionalInt.empty()
+  * added support for deserializing null values into OptionalLong.empty()
 
 v4.1.12 (2017-04-21)
 ---------------------------

pom.xml

@@ -4,7 +4,7 @@
 
 	<groupId>com.arangodb</groupId>
 	<artifactId>arangodb-java-driver-async</artifactId>
-	<version>4.2.0-SNAPSHOT</version>
+	<version>4.2.0</version>
 	<inceptionYear>2016</inceptionYear>
 	<packaging>jar</packaging>
 
@@ -26,7 +26,7 @@
 		<hamcrest-all.version>1.3</hamcrest-all.version>
 		<junit.version>4.12</junit.version>
 		<arangodb-java-driver.version>${project.version}</arangodb-java-driver.version>
-		<arangodb.velocypack.module.jdk8.version>1.0.1</arangodb.velocypack.module.jdk8.version>
+		<arangodb.velocypack.module.jdk8.version>1.0.2</arangodb.velocypack.module.jdk8.version>
 	</properties>
 
 	<developers>