register: Ask for stream_typing_notifications.

We added support for stream typing notifications, and this change
ensures that we get TypingEvents for them.

Signed-off-by: Zixuan James Li <[email protected]>

Author: PIG208

lib/api/route/events.dart

@@ -16,7 +16,7 @@ Future<InitialSnapshot> registerQueue(ApiConnection connection) {
       'notification_settings_null': true,
       'bulk_message_deletion': true,
       'user_avatar_url_field_optional': false, // TODO(#254): turn on
-      'stream_typing_notifications': false, // TODO implement
+      'stream_typing_notifications': true,
       'user_settings_object': true,
     },
   });