push.rst in urbanairship-9.1.1

- old
+ new

@@ -216,9 +216,10 @@
             badge: 123,
             sound: 'sound file',
             extra: { 'key' => 'value', 'key2' => 'value2' },
             expiry: '2019-01-01 12:45:00',
             category: 'category_name',
+            thread_id: 'thread_test',
             interactive: UA.interactive(
                 type: 'ua_share',
                 button_actions: {
                     share: { share: 'Sharing is caring!' }
                 }