Update README.md

Author: mmollina

README.md

@@ -1,6 +1,8 @@
 <!-- badges: start -->
 [![Development](https://img.shields.io/badge/development-active-blue.svg)](https://img.shields.io/badge/development-active-blue.svg)
-[![R-CMD-check](https://github.com/mmollina/viewpoly/workflows/R-CMD-check/badge.svg)](https://github.com/mmollina/viewpoly/actions)
+[![License: GPL v3](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
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 # VIEWpoly <img src="https://user-images.githubusercontent.com/7572527/145726577-7b01d48b-ca1d-446b-b9c8-aff8c3c9877b.png" align="right" width="230"/>