Fix Javadoc link

Author: mpv1989

README.md

@@ -15,5 +15,4 @@ The official ArangoDB Java Driver.
 - [ChangeLog](ChangeLog.md)
 - [Examples](src/test/java/com/arangodb/example)
 - [Tutorial](https://www.arangodb.com/tutorials/tutorial-sync-java-driver/)
-- [JavaDoc](http://arangodb.github.io/arangodb-java-driver/javadoc-4_5/index.html)
-- [JavaDoc VelocyPack](http://arangodb.github.io/java-velocypack/javadoc-1_0/index.html)
+- [JavaDoc](http://arangodb.github.io/arangodb-java-driver/javadoc-5_0)