Update README.md

Author: itachipein

README.md

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 # robotframework-mobileLibrary
 [![Build Status](https://travis-ci.org/Netease-AutoTest/robotframework-mobilelibrary.svg?branch=master)](https://travis-ci.org/Netease-AutoTest/robotframework-mobilelibrary)    [![Latest Version](https://img.shields.io/pypi/v/robotframework-mobilelibrary.svg)](https://pypi.python.org/pypi?%3Aaction=pkg_edit&name=robotframework-mobilelibrary)
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 RobotFramework-MobileLibrary is an modified library based on [robotframework-appiumlibrary](https://github.com/jollychang/robotframework-appiumlibrary), We add some fetures according to our project requirements.
 
 Only support python 2.x.