docs: Update build status badge to GH Actions

Author: mrchief

README.md

@@ -4,12 +4,12 @@
 
 [![NPM version][npm-image]][npm-url] [![gzip][gzip-image]][gzip-url] [![npm download][download-image]][npm-url]
 
-[![build status][travis-image]][travis-url] [![Test coverage][coveralls-image]][coveralls-url] [![Commitizen friendly][commitizen]][commitizen-url] [![semantic-release][semantic-release]][semantic-release-url] [![All Contributors][all-contributors-url]](#contributors) ![npm type definitions][types-url]
+[![build status][buildstatus-image]][buildstatus-url] [![Test coverage][coveralls-image]][coveralls-url] [![Commitizen friendly][commitizen]][commitizen-url] [![semantic-release][semantic-release]][semantic-release-url] [![All Contributors][all-contributors-url]](#contributors) ![npm type definitions][types-url]
 
 [npm-image]: http://img.shields.io/npm/v/react-dropdown-tree-select.svg?style=flat-square
 [npm-url]: http://npmjs.org/package/react-dropdown-tree-select
-[travis-image]: https://travis-ci.org/dowjones/react-dropdown-tree-select.svg?branch=develop
-[travis-url]: https://travis-ci.org/dowjones/react-dropdown-tree-select
+[buildstatus-image]: https://github.com/dowjones/react-dropdown-tree-select/workflows/CI/badge.svg?branch=develop
+[buildstatus-url]: https://github.com/dowjones/react-dropdown-tree-select/actions?query=workflow%3ACI
 [coveralls-image]: https://img.shields.io/coveralls/dowjones/react-dropdown-tree-select.svg?style=flat-square
 [coveralls-url]: https://coveralls.io/r/dowjones/react-dropdown-tree-select?branch=master
 [download-image]: https://img.shields.io/npm/dt/react-dropdown-tree-select.svg?style=flat-square