update README

README.md

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 Phobos则是来自火卫一（，英语发音"FOH bus")，呈土豆形状，一日围绕火星3圈，距火星平均距离约9378公里。
 它是火星的两颗卫星中较大，也是离火星较近的一颗。火卫一与火星之间的距离也是太阳系中所有的卫星与其主星的距离中最短的，从火星表面算起，只有6000千米。它也是太阳系中最小的卫星之一。
 
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-[![Version](https://img.shields.io/cocoapods/v/GMPhobos.svg?style=flat)](http://cocoapods.org/pods/GMPhobos)
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 ## Usage
 
 To run the example project, clone the repo, and run `pod install` from the Example directory first.
 
 ## Requirements
+依赖WMCacheService,和libz库
 
 ## Installation