contrib / subtree / READMEon commit branch: deprecate --set-upstream and show help if we detect possible mistaken use (b347d06)
   1
   2Please read git-subtree.txt for documentation.
   3
   4Please don't contact me using github mail; it's slow, ugly, and worst of
   5all, redundant. Email me instead at apenwarr@gmail.com and I'll be happy to
   6help.
   7
   8Avery