add git-lfs support (#1056)

* add mistyping support for git lfs

* add the rule

* fix flake8

* flake8

* add to readme

* use fixtures and regex

* get rid of additional matched strings

thefuck/rules/git_lfs_mistype.py

@@ -0,0 +1,18 @@
+import re
+from thefuck.utils import get_all_matched_commands, replace_command
+from thefuck.specific.git import git_support
+
+
+@git_support
+def match(command):
+    '''
+    Match a mistyped command
+    '''
+    return 'lfs' in command.script and 'Did you mean this?' in command.output
+
+
+@git_support
+def get_new_command(command):
+    broken_cmd = re.findall(r'Error: unknown command "([^"]*)" for "git-lfs"', command.output)[0]
+    matched = get_all_matched_commands(command.output, ['Did you mean', ' for usage.'])
+    return replace_command(command, broken_cmd, matched)