I.e. "Squash 'somedir' changes" and not "Squashed ..." See https://github.com/git/git/blob/master/contrib/subtree/git-subtree.sh#L463
I.e. "Squash 'somedir' changes" and not "Squashed ..." See https://github.com/git/git/blob/master/contrib/subtree/git-subtree.sh#L463