Update README.md

README.md

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 <a title="Pub" href="https://pub.dev/packages/pocketpy" ><img src="https://img.shields.io/pub/v/pocketpy" /></a>
 <a title="Discord" href="https://discord.gg/WWaq72GzXv" ><img src="https://img.shields.io/discord/1048978026131640390" /></a>
 </p>
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 PocketPy is a lightweight(~5000 LOC) Python interpreter for game engines.
 
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 **English |** [**简体中文**](README_zh.md)
 
 It is extremely easy to embed. Including a compiler, optimizer and bytecode virtual machine. All of them are available in a single header file `pocketpy.h`, without external dependencies.