Update readme.md

Author: tangzx

readme.md

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 # Emmy Lua Language Server
 
+Version | CI status | Download
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+IDEA 171|[![Build status](https://ci.appveyor.com/api/projects/status/djgeh5fq4jhe5xc2?svg=true)](https://ci.appveyor.com/project/EmmyLua/emmylua-languageserver)|[EmmyLua-LS-all.jar](https://ci.appveyor.com/project/EmmyLua/emmylua-languageserver/build/artifacts)
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 Emmy lua Language server have lots of features for lua language, including:
 * Find usages
 * Go to definition