Added version badge for pypi

README.md

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 # Application Insights for Python #
 
+[![PyPI version](https://badge.fury.io/py/applicationinsights.svg)](http://badge.fury.io/py/applicationinsights)
+
 >Python is an easy to learn, powerful programming language. It has efficient high-level data structures and a simple but effective approach to object-oriented programming. Python's elegant syntax and dynamic typing, together with its interpreted nature, make it an ideal language for scripting and rapid application development in many areas on most platforms.
 > -- <cite>[The Python Tutorial - Introduction](https://docs.python.org/3/tutorial/)</cite>