Update README.md

README.md

@@ -10,11 +10,13 @@ It can be configured to add a confirmation page upon saving changes and/or addit
 
 Typical Usage:
 
+```py
     from admin_confirm import AdminConfirmMixin
 
     class MyModelAdmin(AdminConfirmMixin, ModelAdmin):
         confirm_change = True
         confirmation_fields = ['field1', 'field2']
+```
 
 ## Installation