🎓 [Usage] Minor nits

Add period to end of all help strings
Formatting in usage_test.py

Author: KevinHock

detect_secrets/core/usage.py

@@ -81,7 +81,7 @@ def _add_filenames_argument(self):
         self.parser.add_argument(
             'filenames',
             nargs='*',
-            help='Filenames to check',
+            help='Filenames to check.',
         )
         return self
 
@@ -427,5 +427,5 @@ def _add_keyword_exclude(self):
         self.parser.add_argument(
             '--keyword-exclude',
             type=str,
-            help='Pass in regex to exclude false positives found by keyword detector',
+            help='Pass in regex to exclude false positives found by keyword detector.',
         )

tests/core/usage_test.py

@@ -10,7 +10,8 @@ class TestPluginOptions(object):
     @staticmethod
     def parse_args(argument_string=''):
         # PluginOptions are added in pre-commit hook
-        return ParserBuilder().add_pre_commit_arguments()\
+        return ParserBuilder()\
+            .add_pre_commit_arguments()\
             .parse_args(argument_string.split())
 
     def test_added_by_default(self):
@@ -61,9 +62,11 @@ def test_custom_limit(self, argument_string, expected_value):
         if expected_value is not None:
             args = self.parse_args(argument_string)
 
-            assert args.plugins['HexHighEntropyString'][
-                'hex_limit'
-            ] == expected_value
+            assert (
+                args.plugins['HexHighEntropyString']['hex_limit']
+
+                == expected_value
+            )
         else:
             with pytest.raises(SystemExit):
                 self.parse_args(argument_string)