Update README.rst

[ardinusawan]

Change MIDDLEWARE_CLASSES to MIDDLEWARE, https://docs.djangoproject.com/en/1.10/topics/http/middleware/#writing-your-own-middleware

Changed in Django 1.10:
A new style of middleware was introduced for use with the new MIDDLEWARE setting. 
If you’re using the old MIDDLEWARE_CLASSES setting, you’ll need to adapt old, custom middleware before using the new setting. 
This document describes new-style middleware. Refer to this page in older versions of the documentation for a description of how old-style middleware works.

[coveralls]

Coverage remained the same at 88.123% when pulling a511003 on ardinusawan:master into 8b33308 on MindscapeHQ:master.

[coveralls]

Coverage remained the same at 88.123% when pulling a511003 on ardinusawan:master into 8b33308 on MindscapeHQ:master.

[coveralls]

Coverage remained the same at 88.123% when pulling a511003 on ardinusawan:master into 8b33308 on MindscapeHQ:master.