updated readme with supported python / django versions

Author: agateblue

README.rst

@@ -19,13 +19,8 @@ django-dynamic-preferences
     :alt: Sponsors on Open Collective
     :target: #sponsors
 
-.. warning::
-
-    There is a critical bug in version 1.2 that can result in dataloss. Please upgrade to 1.3 as
-    soon as possible and do not use 1.2 in production. See `#81 <https://github.com/agateblue/django-dynamic-preferences/pull/81>`_ for more details.
-
 Dynamic-preferences is a Django app, BSD-licensed, designed to help you manage your project settings. While most of the time,
-a `settings.py` file is sufficient, there are some situations where you need something more flexible such as:
+a ``settings.py`` file is sufficient, there are some situations where you need something more flexible such as:
 
 * per-user settings (or, generally speaking, per instance settings)
 * settings change without server restart
@@ -36,7 +31,7 @@ Dynamic-preferences allow you to register settings (a.k.a. preferences) in a dec
 
 With dynamic-preferences, you can update settings on the fly, through django's admin or custom forms, without restarting your application.
 
-The project is tested and work under Python 2.7 and 3.4, 3.5 and 3.6, with django >=1.8.
+The project is tested and work under Python 3.6, 3.7, 3.8 and 3.9 and with django 2.2, 3.0 and 3.1.
 
 Features
 --------