docs(readme): make semantic-release badge squared

Author: Belco90

README.md

@@ -15,7 +15,7 @@
 [![Package version][version-badge]][version-url]
 [![MIT License][license-badge]][license-url]
 <br>
-[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
+[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg?style=flat-square)](https://github.com/semantic-release/semantic-release)
 [![PRs Welcome][pr-badge]][pr-url]
 <br>
 [![Watch on Github][gh-watchers-badge]][gh-watchers-url]