Remove download stats from README (not working anymore)

Author: pitbulk

README.md

@@ -3,7 +3,6 @@
 [![Build Status](https://api.travis-ci.org/onelogin/python-saml.png?branch=master)](http://travis-ci.org/onelogin/python-saml)
 [![Coverage Status](https://coveralls.io/repos/onelogin/python-saml/badge.png)](https://coveralls.io/r/onelogin/python-saml)
 [![PyPi Version](https://img.shields.io/pypi/v/python-saml.svg)](https://pypi.python.org/pypi/python-saml)
-![PyPi Downloads](https://img.shields.io/pypi/dm/python-saml.svg)
 ![Python versions](https://img.shields.io/pypi/pyversions/python-saml.svg)
 
 Add SAML support to your Python software using this library.