Basic fix for upgrade text bug

I'd love to go back and fix the jankiness of this code sometime, but in the interest of unblocking product, I think this small fixup is probably most optimal.
You can also pass the GET parameters as a dictionary in the second argument, instead of appending them to the URL directly.

https://docs.djangoproject.com/en/1.4/topics/testing/#django.test.client.Client.get