Merge pull request #6 from k8s-team/add-badges

add badges to readme

README.md

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 [![GraphQL logo](https://raw.githubusercontent.com/k8s-team/asynql/master/logo.png)](https://github.com/k8s-team/asynql)
 
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+[![Build Status](https://travis-ci.org/k8s-team/asynql.svg?branch=master)](https://travis-ci.org/k8s-team/asynql) 
+[![Coverage Status](https://coveralls.io/repos/github/k8s-team/asynql/badge.svg?branch=master)](https://coveralls.io/github/k8s-team/asynql?branch=master)
+[![Documentation Status](https://readthedocs.org/projects/asynql/badge/?version=latest)](https://asynql.readthedocs.io/en/latest/?badge=latest) 
+[![Python Version](https://img.shields.io/pypi/pyversions/asynql.svg)](https://pypi.org/project/asynql/) 
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 # asynql
 
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 Asyncio `GraphQL` client
 
 ## Usage