fix: Bumping git version should append the short sha1 to the current version
fix: Bumping git version should append the short sha1 to the current version

The use of `grunt bump:git` simply overwrote the version with the short sha1, but it should really append the sha1 to the current version which this change does.
blargism/grunt-bump,tischler/grunt-bump,aaccurso/grunt-bump-cordova,halkon/grunt-bump,vojtajina/grunt-bump,eddiemonge/grunt-bump,legalthings/grunt-bump,dan-kushnaryov/grunt-bump,walmartlabs/grunt-bump,XciD/grunt-bump