chore: add pypi badge, add git clone instructions

Author: jschaf

README.md

@@ -1,7 +1,7 @@
 pylint-flask
 ===============
 
-[![Build Status](https://travis-ci.org/jschaf/pylint-flask.svg?branch=master)](https://travis-ci.org/jschaf/pylint-flask) [![Coverage Status](https://coveralls.io/repos/jschaf/pylint-flask/badge.svg?branch=master)](https://coveralls.io/r/jschaf/pylint-flask?branch=master) [![License](https://img.shields.io/badge/license-GPLv2%20License-blue.svg)](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html)
+[![Build Status](https://travis-ci.org/jschaf/pylint-flask.svg?branch=master)](https://travis-ci.org/jschaf/pylint-flask) [![Coverage Status](https://coveralls.io/repos/jschaf/pylint-flask/badge.svg?branch=master)](https://coveralls.io/r/jschaf/pylint-flask?branch=master) [![PyPI](https://img.shields.io/pypi/v/pylint-flask.svg)](https://pypi.python.org/pypi/pylint-flask) [![License](https://img.shields.io/badge/license-GPLv2%20License-blue.svg)](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html)
 
 ## About
 
@@ -49,7 +49,7 @@ pylint --load-plugins pylint_flask [..your module..]
 Pull requests are always welcome.  Here's an outline of the steps you need to
 prepare your code.
 
-1. https://github.com/jschaf/pylint-flask.git
+1. git clone https://github.com/jschaf/pylint-flask.git
 2. cd pylint-flask
 3. mkvirtualenv pylint-flask
 4. pip install -r dev-requirements.txt