MAINT: Update ci status link in readme

Author: bluss

README.md

@@ -4,7 +4,11 @@ arrayvec
 [![Crates.io: arrayvec](https://img.shields.io/crates/v/arrayvec.svg)](https://crates.io/crates/arrayvec)
 [![Crates.io: nodrop](https://img.shields.io/crates/v/nodrop.svg)](https://crates.io/crates/nodrop)
 [![Documentation](https://docs.rs/arrayvec/badge.svg)](https://docs.rs/arrayvec)
-[![Build Status](https://travis-ci.org/bluss/arrayvec.svg?branch=master)](https://travis-ci.org/bluss/arrayvec)
+[![Build Status](https://github.com/bluss/arrayvec/workflows/Continuous%20integration/badge.svg?branch=master)](https://github.com/bluss/arrayvec/actions)
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 [![License: Apache](https://img.shields.io/badge/License-Apache%202.0-red.svg)](LICENSE-APACHE)
 OR
 [![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)