Add the github Action badge

lu-zero · gnzlbg · commit 11184f1003bd · 2019-10-11T09:16:33.000+02:00
diff --git a/README.md b/README.md
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 stdarch - Rust's standard library SIMD components
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+[![Actions Status](https://github.com/rust-lang/stdarch/workflows/CI/badge.svg)](https://github.com/rust-lang/stdarch/actions)
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 # Crates
 
 This repository contains two main crates:
