Update README.md

Author: ms-jpq

README.md

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 # Neovim Async Tutorial (lua)
 
+Async Await in [90 lines](https://github.com/ms-jpq/neovim-async-tutorial/blob/master/lua/async.lua) of code.
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 ## Preface
 
 This tutorial assumes that you are familiar with the concept of `async` `await`