Update PULL_REQUEST_TEMPLATE.md

Author: lokesh

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,4 @@
-Pull Requests are welcome. But note that v2 of Lightbox is in Maintenance Mode and no new features
-will be added to the main line. See the [Roadmap](https://github.com/lokesh/lightbox2/blob/master/ROADMAP.md).
-
-PRs submitted will still be reviewed and then kept open for other users to utilize.
+> Pull Requests are welcome. But note that v2 of Lightbox is in Maintenance Mode and no new features
+> will be added. See the [Roadmap](https://github.com/lokesh/lightbox2/blob/master/ROADMAP.md).
+> 
+> PRs submitted will still be reviewed and then kept open for other users to utilize.