Use shields.io instead of pypip.in

Author: jpadilla

README.md

@@ -184,7 +184,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 [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
-[pypi-version]: https://pypip.in/version/djangorestframework/badge.svg
+[pypi-version]: https://img.shields.io/pypi/v/djangorestframework.svg
 [pypi]: https://pypi.python.org/pypi/djangorestframework
 [twitter]: https://twitter.com/_tomchristie
 [group]: https://groups.google.com/forum/?fromgroups#!forum/django-rest-framework