docs: update pushTo description
docs: update pushTo description

Update the `pushTo` description to state that it pushes to the named remote in your repo.

Fixes #112

legalthings/grunt-bump,dan-kushnaryov/grunt-bump,halkon/grunt-bump,tischler/grunt-bump,XciD/grunt-bump,blargism/grunt-bump,walmartlabs/grunt-bump,vojtajina/grunt-bump,eddiemonge/grunt-bump