Update future-fstrings and stop concatenating multiline strings

mautrix_appservice/errors.py

@@ -31,7 +31,7 @@ class MatrixRequestError(MatrixError):
     """ The home server returned an error response. """
 
     def __init__(self, code=0, text="", errcode=None, message=None):
-        super().__init__("%d: %s" % (code, text))
+        super().__init__(f"{code}: {text}")
         self.code = code
         self.text = text
         self.errcode = errcode

mautrix_appservice/intent_api.py

@@ -524,7 +524,7 @@ class IntentAPI:
             self.log.warning(
                 f"Power level of {self.mxid} is not enough for {event_type} in {room_id}")
             # raise IntentError(f"Power level of {self.mxid} is not enough"
-            #                  + f"for {event_type} in {room_id}")
+            #                   f"for {event_type} in {room_id}")
             return
         # TODO implement