Update README.md

Author: kangwang1988

README.md

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 # XcodeZombieCode
 iOS APP分析无用代码(A source-code level/Clang Approach)
 [CLANG技术分享系列四:IOS APP无用代码/重复代码分析](http://kangwang1988.github.io/tech/2016/11/01/find-unused-duplicate-code-of-your-app-using-clang-plugin.html)
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+Branch[Master]:
+Using clang plugin as an approach.If you want to debug the analyzing code, use logs.
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+Branch[Libtooling]:
+Using libtooling as an approach.You can debug the analyzing code directly.