updated Readme

Author: eadwinCode

README.md

@@ -18,7 +18,7 @@ For full documentation, [visit](https://eadwincode.github.io/django-ninja-jwt/).
 - Python >= 3.6
 - Django >= 2.1
 - Django-Ninja >= 0.16.1
-- Ninja-Schema >= 0.12.2
+- Ninja-Schema >= 0.12.8
 - Django-Ninja-Extra >= 0.11.0