Switch ci-badge from travis to github-actions
Switch ci-badge in `README.md` from travis to github-actions
<a href="https://docs.rs/telebofr/">
<img src="https://img.shields.io/badge/docs.rs-link-blue.svg">
</a>
- <a href="https://travis-ci.com/telebofr/telebofr">
- <img src="https://travis-ci.com/telebofr/telebofr.svg?branch=dev" />
+ <a href="https://github.com/WaffleLapkin/fntools/actions">
+ <img src="https://github.com/WaffleLapkin/fntools/workflows/Continuous%20integration/badge.svg">
</a>
<a href="LICENSE">
<img src="https://img.shields.io/badge/license-MIT-blue.svg">
