Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit 34ae65b06128077751ec2b923c9740a429d8299d.
Revert "[maven-release-plugin] prepare release v0.9.0-incubating"

This reverts commit 00c847af1d4be2fe5fad887a57857eead1e517dc.
Updating CHANGES.txt
[maven-release-plugin] prepare release v0.9.0-incubating
[maven-release-plugin] prepare for next development iteration