mention correct Python versions in the readme

Author: stebunovd

README.rst

@@ -6,7 +6,7 @@ DjangoQL
 
 Advanced search language for Django, with auto-completion. Supports logical
 operators, parenthesis, table joins, and works with any Django model. Tested on
-Python 2.7, 3.5 - 3.11, Django 1.8 - 5.0. The auto-completion feature has been
+Python 2.7, 3.6 - 3.12, Django 1.8 - 5.0. The auto-completion feature has been
 tested in Chrome, Firefox, Safari, IE9+.
 
 See a video: `DjangoQL demo <https://youtu.be/oKVff4dHZB8>`_