Improved Readme

Author: syrusakbary

README.md

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 # GraphQL WS
 
-.. image:: https://img.shields.io/pypi/v/graphql\_ws.svg :target: https://pypi.python.org/pypi/graphql\_ws
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-.. image:: https://img.shields.io/travis/graphql-python/graphql\_ws.svg :target: https://travis-ci.org/graphql-python/graphql\_ws
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-.. image:: https://readthedocs.org/projects/graphql-aiows/badge/?version=latest :target: https://graphql-aiows.readthedocs.io/en/latest/?badge=latest :alt: Documentation Status
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-.. image:: https://pyup.io/repos/github/graphql-python/graphql\_ws/shield.svg :target: https://pyup.io/repos/github/graphql-python/graphql\_ws/ :alt: Updates
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 Websocket server for GraphQL subscriptions.
 
--   Free software: MIT license
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 # Installation instructions
 
 For having a demo with Python 3.6: