fix(client): move options list before arguments

Docopt does not allow additional commands after ellipsis as it's hard
to determine when they end (e.g. is this argument an arg or an option?).

Author: Matthew Fisher

client/deis.py

@@ -1445,7 +1445,7 @@ def limits_unset(self, args):
         """
         Unsets resource limits for an application.
 
-        Usage: deis limits:unset [--memory | --cpu] <type>... [options]
+        Usage: deis limits:unset [options] [--memory | --cpu] <type>...
 
         Arguments:
           <type>