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

This reverts commit 685bdd2b7e584c84e7d39e40de2d5f30c5388cb5.
Revert "[maven-release-plugin] prepare release v1.1.1-rc1"

This reverts commit 72a4fdbe82203b962fe776d0edaed7f56898cb02.