Update and rename README.md to readme.md

Author: ZoranPandovski

README.md readme.mdREADME.md renamed to readme.md

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 </h1>
 
-[![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](https://github.com/ZoranPandovski/pycoincap/issues)
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+[![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](https://github.com/ZoranPandovski/pycoincap/issues)
+[![License](https://img.shields.io/badge/license-MIT%20License-brightgreen.svg)](https://opensource.org/licenses/MIT)
 
 # Pycoincap
 Python module for getting data from Coinmarketcap, cryptocurrencies market cap, rankings, price, supply, circulating supply and other useful informations.