comma after last element of the config.

Author: petericebear

README.md

@@ -57,7 +57,7 @@ Add your Messagebird Access Key, Default originator (name or number of sender),
 'messagebird' => [
     'access_key' => env('MESSAGEBIRD_ACCESS_KEY'),
     'originator' => env('MESSAGEBIRD_ORIGINATOR'),
-    'recipients' => env('MESSAGEBIRD_RECIPIENTS')
+    'recipients' => env('MESSAGEBIRD_RECIPIENTS'),
 ],
 ...
 ```