Content Templates no longer need to be sent with Messaging Services

Sending Content Templates with a messaging service sid in the from or a MessagingServiceSid field is now optional!

Previously using a messaging service and specifying its sid was a requirement to use Content Templates. Now customers can send a content template by using the standard to and from fields containing a phone number with the sender prefix if relevant. 

Previous methods of sending a content template using messaging service sid will still be supported.