Fix / improve recently merged patches + CI

src/flake8/checker.py

@@ -81,7 +81,7 @@ class Manager(object):
             "tokens": 0,
         }
         self.exclude = tuple(
-            itertools.chain(self.options.exclude, self.options.extend_exclude),
+            itertools.chain(self.options.exclude, self.options.extend_exclude)
         )
 
     def _process_statistics(self):

src/flake8/main/options.py

@@ -93,7 +93,7 @@ def register_default_options(option_manager):
         parse_from_config=True,
         comma_separated_list=True,
         help="Comma-separated list of files or directories to add to the list"
-        " of excluded ones."
+        " of excluded ones.",
     )
 
     add_option(

src/flake8/utils.py

@@ -386,7 +386,7 @@ def filenames_from(arg, predicate=None):
 
 
 def fnmatch(filename, patterns):
-    # type: (str, List[str]) -> bool
+    # type: (str, Sequence[str]) -> bool
     """Wrap :func:`fnmatch.fnmatch` to add some functionality.
 
     :param str filename:
@@ -453,7 +453,7 @@ def parameters_for(plugin):
 
 
 def matches_filename(path, patterns, log_message, logger):
-    # type: (str, List[str], str, logging.Logger) -> bool
+    # type: (str, Sequence[str], str, logging.Logger) -> bool
     """Use fnmatch to discern if a path exists in patterns.
 
     :param str path: