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

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

notifiers/providers/join.py

@@ -35,7 +35,7 @@ def _join_request(url: str, data: dict) -> tuple:
                     errors = [response.text]
             else:
                 response = None
-                errors = [(str(e))]
+                errors = [str(e)]
 
         return response, errors