update back pre-commit hook

specify minimum target_version as py36

results in some churn

jupyterhub/services/auth.py

@@ -287,7 +287,7 @@ class HubAuth(SingletonConfigurable):
 
     def _check_hub_authorization(self, url, cache_key=None, use_cache=True):
         """Identify a user with the Hub
-        
+
         Args:
             url (str): The API URL to check the Hub for authorization
                        (e.g. http://127.0.0.1:8081/hub/api/authorizations/token/abc-def)
@@ -603,10 +603,10 @@ class HubOAuth(HubAuth):
 
     def token_for_code(self, code):
         """Get token for OAuth temporary code
-        
+
         This is the last step of OAuth login.
         Should be called in OAuth Callback handler.
-        
+
         Args:
             code (str): oauth code for finishing OAuth login
         Returns: