add '--help' to heroku commands

ffe8e546 · Paul Robertson · 3ea33841 · ffe8e546
Commit ffe8e546 authored Jul 09, 2015 by Paul Robertson
--- a/plugins/heroku/_heroku
+++ b/plugins/heroku/_heroku
@@ -143,5 +143,6 @@ _arguments \
  $_command_args \
  '(--app)--app[the app name]' \
  '(--remote)--remote[the remote name]' \
+  '(--help)--help[help about the current command]' \
  &&  return 0