deprecate React-Hot-Loader, fixes #1453

Author: theKashey

README.md

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+# ⚠️ So Long, and Thanks for All the Fish ⚠️ 
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+React-Hot-Loader was our dear friend for quite a while, but everything should have the end.
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+It's time to migrate to [Fast Refresh](https://www.npmjs.com/package/react-refresh). 
+See [#1453](https://github.com/gaearon/react-hot-loader/issues/1453) in order to find a guide for your platform.
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+🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥
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 # React Hot Loader
 
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