Test protected branches

README.md

@@ -157,7 +157,6 @@ If you believe you’ve found something in Django REST framework which has secur
 
 Send a description of the issue via email to [rest-framework-security@googlegroups.com][security-mail].  The project maintainers will then work with you to resolve any issues where required, prior to any public disclosure.
 
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 [build-status-image]: https://secure.travis-ci.org/tomchristie/django-rest-framework.svg?branch=master
 [travis]: http://travis-ci.org/tomchristie/django-rest-framework?branch=master
 [coverage-status-image]: https://img.shields.io/codecov/c/github/tomchristie/django-rest-framework/master.svg