Fix issue of decoding non-json in successful post case

drivers/groupme_driver.py

@@ -89,7 +89,7 @@ class GroupMeBot(rollbot.Rollbot[GroupMeMessage]):
             json=body,
             timeout=10,
         )
-        self.context.logger.info(f"Received: {result.status} - {await result.json()}")
+        self.context.logger.info(f"Received: {result.status} - {await result.text()}")
 
     async def respond(self, res: rollbot.Response):
         # sleep for a moment to make groupme not misorder messages