Update README.md

Author: g1eny0ung

README.md

@@ -7,11 +7,9 @@
 </p>
 <p align="center">A date library <a href="https://github.com/iamkun/dayjs/">Day.js</a> in dart.</p>
 
-<p align="center">
-  <img alt="Pub" src="https://img.shields.io/pub/v/day.svg">
-  <img src="https://travis-ci.org/dayjs/day.dart.svg?branch=master" alt="Travis CI" />
-  <img alt="GitHub" src="https://img.shields.io/github/license/g1eny0ung/day.dart.svg">
-</p>
+![Pub Version](https://img.shields.io/pub/v/day)
+[![Dart](https://github.com/dayjs/day.dart/actions/workflows/dart.yml/badge.svg)](https://github.com/dayjs/day.dart/actions/workflows/dart.yml)
+![GitHub License](https://img.shields.io/github/license/dayjs/day.dart)
 
 > Day.dart is inspired by Day.js. Write with nearly the same API. Build on the top of the powerful **DateTime** class.