String representation in Message class

Author: lahirumaramba

firebase_admin/_messaging_utils.py

@@ -57,6 +57,9 @@ def __init__(self, data=None, notification=None, android=None, webpush=None, apn
         self.topic = topic
         self.condition = condition
 
+    def __str__(self):
+        return json.dumps(MessageEncoder().default(self))
+
 
 class MulticastMessage(object):
     """A message that can be sent to multiple tokens via Firebase Cloud Messaging.