fix: flake8

Author: Bucknalla

notecard/notecard.py

@@ -365,7 +365,7 @@ def Transaction(self, req, lock=True):
                             if self._debug:
                                 try:
                                     print('Response has heartbeat field indicating ' + \
-                                        f'heartbeat: {rsp_json["status"]}')
+                                          f'heartbeat: {rsp_json["status"]}')
                                 except Exception as e:
                                     print(e)