[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

tests/unit/test_container.py

@@ -179,7 +179,7 @@ def test_set_parent_overwrite_proxy(self):
 
     def test_slash_restriction(self):
         self.assertRaises(ValueError, Container, 'bad/name')
-    
+
     def test_colon_restriction(self):
         self.assertRaises(ValueError, Container, 'bad:name')