add space

README.md

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 [![Gitter](https://badges.gitter.im/walkor/Workerman.svg)](https://gitter.im/walkor/Workerman?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=body_badge)
 
 ## What is it
-Workerman is an asynchronous event driven PHP framework with high performance for easily building fast, scalable network applications.Supports HTTP, Websocket and other custom protocols. Supports libevent, HHVM, [ReactPHP](https://github.com/reactphp/react).
+Workerman is an asynchronous event driven PHP framework with high performance for easily building fast, scalable network applications. Supports HTTP, Websocket and other custom protocols. Supports libevent, HHVM, [ReactPHP](https://github.com/reactphp/react).
 
 ## Requires