Update README.md

Author: baseplate-admin

README.md

@@ -6,7 +6,7 @@ using the native Postgres extension `ltree`.
 Postgresql has already a optimized and very useful tree implementation for data.
 The extension is [ltree](https://www.postgresql.org/docs/9.6/static/ltree.html)
 
-This fork contains is a continuation of the work done by [`mariocesar`](https://github.com/mariocesar/) on [`django-ltree`](https://github.com/mariocesar/django-ltree).
+This fork contains is a continuation of the work done by [`mariocesar`](https://github.com/mariocesar/) on [`django-ltree`](https://github.com/mariocesar/django-ltree) and merges the work done by [`simkimsia`](https://github.com/simkimsia) on [`greendeploy-django-ltree`](https://github.com/GreenDeploy-io/greendeploy-django-ltree)
 
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