Merge branch 'hu/cherry-pick-previous-branch'

Just like "git checkout -" knows to check out and "git merge -"
knows to merge the branch you were previously on, "git cherry-pick"
now understands "git cherry-pick -" to pick from the previous
branch.

* hu/cherry-pick-previous-branch:
  cherry-pick: allow "-" as abbreviation of '@{-1}'

builtin/revert.c

@@ -202,6 +202,8 @@ int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
 	memset(&opts, 0, sizeof(opts));
 	opts.action = REPLAY_PICK;
 	git_config(git_default_config, NULL);
+	if (!strcmp(argv[1], "-"))
+		argv[1] = "@{-1}";
 	parse_args(argc, argv, &opts);
 	res = sequencer_pick_revisions(&opts);
 	if (res < 0)