Added subject line to MMS example

IbrahimTareq · web-flow · commit 5e506ee1e1cb · 2018-10-28T15:36:29.000+11:00
diff --git a/README.md b/README.md
@@ -116,6 +116,7 @@ var body = new sdk.SendMessagesRequest({
          "content":"My first message",
          "destination_number":"YOUR_MOBILE_NUMBER",
          "format":"MMS",
+         "subject": "This is an MMS message",
          "media":"https://upload.wikimedia.org/wikipedia/commons/6/6a/L80385-flash-superhero-logo-1544.png"
       }
    ]

Original file line number	Diff line number	Diff line change
`@@ -116,6 +116,7 @@ var body = new sdk.SendMessagesRequest({`
`116`	`116`	`"content":"My first message",`
`117`	`117`	`"destination_number":"YOUR_MOBILE_NUMBER",`
`118`	`118`	`"format":"MMS",`
	`119`	`+ "subject": "This is an MMS message",`
`119`	`120`	`"media":"https://upload.wikimedia.org/wikipedia/commons/6/6a/L80385-flash-superhero-logo-1544.png"`
`120`	`121`	`}`
`121`	`122`	`]`