remove travis ci badge and add github workflows badge

Author: jim4067

README.md

@@ -3,7 +3,7 @@
 `annotate-snippets` is a Rust library for annotation of programming code slices.
 
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-[![Build Status](https://travis-ci.org/rust-lang/annotate-snippets-rs.svg?branch=master)](https://travis-ci.org/rust-lang/annotate-snippets-rs)
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 The library helps visualize meta information annotating source code slices.