[google_chat_ros] Fix https to url

Author: tkmtnt7000

google_chat_ros/scripts/google_chat_ros_node.py

@@ -86,7 +86,7 @@ def __init__(self):
             rospy.logwarn("You cannot recieve Google Chat event because HTTPS server or Google Cloud Pub/Sub is not running.")
 
         else:
-            rospy.logerr("Please choose receiving_mode param from dialogflow, https, pubsub, none.")
+            rospy.logerr("Please choose receiving_mode param from dialogflow, url, pubsub, none.")
 
     def killhttpd(self):
         self._server.kill()