Comply to new flake8 3.6 (#853)

* #N/A: Ignore W504 line break after binary operator

W504 is now part of flake8 current version 3.6

* #N/A: Fix invalid escape sequences

* #N/A: Remove conflicting path before installing gcc with brew

thefuck/rules/aws_cli.py

@@ -3,7 +3,7 @@ import re
 from thefuck.utils import for_app, replace_argument
 
 INVALID_CHOICE = "(?<=Invalid choice: ')(.*)(?=', maybe you meant:)"
-OPTIONS = "^\s*\*\s(.*)"
+OPTIONS = "^\\s*\\*\\s(.*)"
 
 
 @for_app('aws')

thefuck/rules/az_cli.py

@@ -3,7 +3,7 @@ import re
 from thefuck.utils import for_app, replace_argument
 
 INVALID_CHOICE = "(?=az)(?:.*): '(.*)' is not in the '.*' command group."
-OPTIONS = "^The most similar choice to '.*' is:\n\s*(.*)$"
+OPTIONS = "^The most similar choice to '.*' is:\n\\s*(.*)$"
 
 
 @for_app('az')

thefuck/rules/heroku_multiple_apps.py

@@ -8,5 +8,5 @@ def match(command):
 
 
 def get_new_command(command):
-    apps = re.findall('([^ ]*) \([^)]*\)', command.output)
+    apps = re.findall('([^ ]*) \\([^)]*\\)', command.output)
     return [command.script + ' --app ' + app for app in apps]

thefuck/shells/generic.py

@@ -82,7 +82,7 @@ class Generic(object):
         encoded = self.encode_utf8(command)
 
         try:
-            splitted = [s.replace("??", "\ ") for s in shlex.split(encoded.replace('\ ', '??'))]
+            splitted = [s.replace("??", "\\ ") for s in shlex.split(encoded.replace('\\ ', '??'))]
         except ValueError:
             splitted = encoded.split(' ')