chore: update readme logo

Author: zaucy

README.md

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+<p align="center">
+	<img src="https://ecsact.dev/assets/logo.svg" width="300" />
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 # Ecsact + Wasm = :heart:
 
 Compile your [Ecsact](https://ecsact.dev) system implementations in [WebAssembly](https://webassembly.org/) with your favourite language and use it _anywhere_.