Update README.md

Author: romis2012

README.md

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 [![Build Status](https://travis-ci.org/romis2012/python-socks.svg?branch=master)](https://travis-ci.org/romis2012/python-socks)
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+[![Downloads](https://pepy.tech/badge/python-socks/month)](https://pepy.tech/project/python-socks)
 
 The `python-socks` package provides a core proxy client functionality for Python.
 Supports SOCKS4(a), SOCKS5, HTTP (tunneling) proxy and provides sync and async (asyncio, trio, curio) APIs.