bumped up required python and updated the docs (#31)

Author: eadwinCode

docs/customizing_token_claims.md

@@ -68,6 +68,33 @@ from ninja import NinjaAPI
 api = NinjaAPI()
 api.add_router('', tags=['Auth'], router=router)
 ```
+Also, its important to note that `NinjaExtra` registers a handler for `APIException` class which is not available in `NinjaAPI` instance.
+To fix that, you need the extra code below:
+
+```python
+from ninja import NinjaAPI
+from ninja_extra import exceptions
+
+api = NinjaAPI()
+api.add_router('', tags=['Auth'], router=router)
+
+def api_exception_handler(request, exc):
+    headers = {}
+
+    if isinstance(exc.detail, (list, dict)):
+        data = exc.detail
+    else:
+        data = {"detail": exc.detail}
+
+    response = api.create_response(request, data, status=exc.status_code)
+    for k, v in headers.items():
+        response.setdefault(k, v)
+
+    return response
+
+api.exception_handler(exceptions.APIException)(api_exception_handler)
+```
+
 
 
 ### Controller Schema Swapping

pyproject.toml

@@ -12,7 +12,7 @@ authors = [
    {name = "Ezeudoh Tochukwu", email = "[email protected]"},
 ]
 dynamic = ["version", "description"]
-requires-python = ">=3.6"
+requires-python = ">=3.7"
 readme = "README.md"
 home-page = "https://github.com/eadwinCode/django-ninja-jwt"
 classifiers = [
@@ -29,7 +29,6 @@ classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",