Use formatting of logger

jh0ker · jh0ker · commit 7d7779709f59 · 2018-04-16T00:35:20.000+02:00
diff --git a/telegram/utils/request.py b/telegram/utils/request.py
@@ -151,7 +151,7 @@ def _parse(json_data):
             data = json.loads(decoded_s)
         except UnicodeDecodeError:
             logging.getLogger(__name__).debug(
-                'Logging raw invalid UTF-8 response:\n{}'.format(str(json_data)))
+                'Logging raw invalid UTF-8 response:\n%s', str(json_data))
             raise TelegramError('Server response could not be decoded using UTF-8')
         except ValueError:
             raise TelegramError('Invalid server response')
