Merge branch 'mg/complete-cherry-mark-to-log'

The completion scripts (in contrib/) did not include the
"--cherry-mark" option when completing "git log <HT>".

* mg/complete-cherry-mark-to-log:
  completion: complete --cherry-mark for git log

contrib/completion/git-completion.bash

@@ -1458,6 +1458,7 @@ _git_log ()
 			--relative-date --date=
 			--pretty= --format= --oneline
 			--show-signature
+			--cherry-mark
 			--cherry-pick
 			--graph
 			--decorate --decorate=