the staging repo is automatically closed and released (#276)

Author: raboof

RELEASING.md

@@ -4,8 +4,7 @@
   * the next tag version (e.g. `v0.11`)
   * title and release description including notable changes
   * link to the [milestone](https://github.com/lightbend/genjavadoc/milestones) showing an overview of closed issues for this release
-2. This should push the release to sonatype from travis
-3. Login to [Sonatype](https://oss.sonatype.org/) to close and release the repository.
+2. This should push the artifacts from travis to sonatype, and then close and release the repository.
 
 ## Back-releasing for a new Scala version