Improve README phrasing
Improve README phrasing

martinda/git-plugin,MarkEWaite/git-plugin,MarkEWaite/git-plugin,martinda/git-plugin,martinda/git-plugin,jenkinsci/git-plugin,jenkinsci/git-plugin,MarkEWaite/git-plugin,jenkinsci/git-plugin,MarkEWaite/git-plugin,jenkinsci/git-plugin