Update README.md

Author: ms-jpq

README.md

@@ -2,12 +2,12 @@
 
 Async Await in [90 lines](https://github.com/ms-jpq/neovim-async-tutorial/blob/master/lua/async.lua) of code.
 
-## Preface
-
-### Special Thanks
+## Special Thanks
 
 [svermeulen](https://github.com/svermeulen) for fixing [inability to return functions](https://github.com/ms-jpq/neovim-async-tutorial/issues/2).
 
+## Preface
+
 This tutorial assumes that you are familiar with the concept of `async` `await`
 
 You will also need to read through the [first 500 words](https://www.lua.org/pil/9.1.html) of how coroutines work in lua.