docs: add Django Modal Actions as a similar package (#173)

Adding new Django Modal Actions package
Deleting Django Object Actions which hasn't had a commit in 3 years

Author: crccheck

README.md

@@ -244,10 +244,9 @@ Some commands assume you are in the virtualenv. If you see
 
 ## Similar Packages
 
+[Django Modal Actions](https://github.com/Mng-dev-ai/django-modal-actions) can
+open a simple form in a modal dialog.
+
 If you want an actions menu for each row of your changelist, check out [Django
 Admin Row Actions](https://github.com/DjangoAdminHackers/django-admin-row-actions).
 
-Django Object Actions is very similar to
-[django-object-tools](https://github.com/praekelt/django-object-tools), but does
-not require messing with your urls.py, does not do anything special with
-permissions, and uses the same patterns as making [admin actions].