Auto-link to the latest version on Bintray (#519)

And, specifically, the Maven Central tab

RELEASING.md

@@ -1,15 +1,13 @@
 # Releasing
 
-## Releasing
-
 1. Update the version number in the `akka-grpc-xx-stable` project name in the [whitesource web UI](https://saas.whitesourcesoftware.com)
     - For example you'd call the project `akka-grpc-0.2-stable`
 1. Create a [new release](https://github.com/akka/akka-grpc/releases/new) with the next tag version (e.g. `v0.2`), title and release description including notable changes mentioning external contributors.
 1. Travis CI will start a [CI build](https://travis-ci.org/akka/akka-grpc/builds) for the new tag and publish:
   - SBT Plugin is published to [Bintray](https://bintray.com/akka/sbt-plugin-releases) that is linked the SBT plugins repo (no further steps required) 
   - Gradle plugin directly to the Gradle plugin portal (no further steps required)
   - Library jars to [Bintray](https://bintray.com/akka/maven) that needs to be synced with Maven Central
-1. Login to [Bintray](https://bintray.com/akka/maven/akka-grpc) and sync to Maven Central.
+1. [Sync](https://bintray.com/akka/maven/akka-grpc/_latestVersion#central) from Bintray to Maven Central
 
 Due to https://github.com/akka/akka-grpc/issues/365, when the tag is created
 before that commit has been been successfully built for the 'master' branch,