Added self: Any linter test

tools/custom_check.py

@@ -137,6 +137,10 @@ def build_custom_checkers(by_lang):
          'description': 'Missing whitespace after "#"'},
         {'pattern': "assertEquals[(]",
          'description': 'Use assertEqual, not assertEquals (which is deprecated).'},
+        {'pattern': 'self: Any',
+         'description': 'you can omit Any annotation for self',
+         'good_lines': ['def foo (self):'],
+         'bad_lines': ['def foo(self: Any):']},
         {'pattern': "== None",
          'description': 'Use `is None` to check whether something is None'},
         {'pattern': "type:[(]",