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

This reverts commit c204a742a9eb9d3fd318e0f059bd00cbfb8b2c14.
Revert "[maven-release-plugin] prepare release v1.1.0-snapshot1"

This reverts commit d428d88418d385d1d04e1b0adcb6b068efe9c7b0.