Commas added in README (#7730)

To make it more comfortable for users to copy and paste snippets

Author: ihoru

README.md

@@ -113,7 +113,7 @@ router.register(r'users', UserViewSet)
 # Additionally, we include login URLs for the browsable API.
 urlpatterns = [
     path('', include(router.urls)),
-    path('api-auth/', include('rest_framework.urls', namespace='rest_framework'))
+    path('api-auth/', include('rest_framework.urls', namespace='rest_framework')),
 ]
 ```
 
@@ -131,7 +131,7 @@ REST_FRAMEWORK = {
     # Use Django's standard `django.contrib.auth` permissions,
     # or allow read-only access for unauthenticated users.
     'DEFAULT_PERMISSION_CLASSES': [
-        'rest_framework.permissions.DjangoModelPermissionsOrAnonReadOnly'
+        'rest_framework.permissions.DjangoModelPermissionsOrAnonReadOnly',
     ]
 }
 ```