doc(readme): update badges

Author: idiotWu

README.md

@@ -4,7 +4,7 @@
 [![monthly downloads][npm-downloads-badge]](https://www.npmjs.com/package/smooth-scrollbar)
 [![core size][size-badge]](dist/smooth-scrollbar.js)
 [![gzip size][gzip-size-badge]](dist/smooth-scrollbar.js)
-[![Build status][travis-badge]](https://travis-ci.com/idiotWu/smooth-scrollbar)
+[![Build status][github-action-badge]](https://travis-ci.com/idiotWu/smooth-scrollbar)
 [![Gitpod Ready-to-Code][gitpod-badge]](https://gitpod.io/from-referrer/)
 
 Customizable, Flexible, and High Performance Scrollbars!
@@ -95,7 +95,7 @@ If you are not using any bundlers, you can just load the UMD bundle:
 
 [npm-version-badge]: https://img.shields.io/npm/v/smooth-scrollbar.svg?style=for-the-badge
 [npm-downloads-badge]: https://img.shields.io/npm/dm/smooth-scrollbar.svg?style=for-the-badge
-[travis-badge]: https://img.shields.io/travis/idiotWu/smooth-scrollbar.svg?style=for-the-badge
+[github-action-badge]: https://img.shields.io/github/workflow/status/idiotWu/smooth-scrollbar/Deploy%20to%20GitHub%20Pages?style=for-the-badge
 [size-badge]: http://img.badgesize.io/idiotWu/smooth-scrollbar/master/dist/smooth-scrollbar.js?label=core%20size&style=for-the-badge
 [gzip-size-badge]: http://img.badgesize.io/idiotWu/smooth-scrollbar/master/dist/smooth-scrollbar.js?label=gzip%20size&compression=gzip&style=for-the-badge
 [gitpod-badge]: https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?style=for-the-badge