Update README.md

Author: Avasil

README.md

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 A mini testing framework cross-compiled for Scala 2.11, 2.12,
 2.13, [Scala.js 0.6.x & 1.0.x](http://www.scala-js.org/) and
-[Scala Native 0.3.x](https://www.scala-native.org/).
+[Scala Native 0.3.x & 0.4.0-M2](https://www.scala-native.org/).
 
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