Add fuck --hard as alternative to fuck --yeah (#963)

* Add fuck --hard as alternative to fuck --yeah

* Fix missing comma in thefuck/argument_parser.py

Co-Authored-By: lomckee <cstutoringluke@gmail.com>

* Update README on fuck --hard

thefuck/argument_parser.py

@@ -55,7 +55,7 @@ class Parser(object):
         """It's too dangerous to use `-y` and `-r` together."""
         group = self._parser.add_mutually_exclusive_group()
         group.add_argument(
-            '-y', '--yes', '--yeah',
+            '-y', '--yes', '--yeah', '--hard',
             action='store_true',
             help='execute fixed command without confirmation')
         group.add_argument(