[maven-release-plugin] prepare release git-3.1.0
[maven-release-plugin] prepare release git-3.1.0

v1v/git-plugin,MarkEWaite/git-plugin,MarkEWaite/git-plugin,kzantow/git-plugin,jacob-keller/git-plugin,recena/git-plugin,v1v/git-plugin,jenkinsci/git-plugin,martinda/git-plugin,jacob-keller/git-plugin,martinda/git-plugin,recena/git-plugin,MarkEWaite/git-plugin,jenkinsci/git-plugin,recena/git-plugin,kzantow/git-plugin,v1v/git-plugin,jenkinsci/git-plugin,jenkinsci/git-plugin,martinda/git-plugin,kzantow/git-plugin,MarkEWaite/git-plugin,jacob-keller/git-plugin