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

This reverts commit 9c8d9ead30660c2a49e0a2ad48460584dbc8d1ca.
Revert "[maven-release-plugin] prepare release SunriseSunsetCalculator-1.2"

This reverts commit e6d4047a5977045ad8b69d601b8b8d890ee880d0.