update GitHub License badge

Author: Carol-seven

README.md

@@ -4,7 +4,7 @@
 [![GitHub R package version](https://img.shields.io/github/r-package/v/Carol-seven/grasps?label=R%20in%20dev&color=green)](https://github.com/Carol-seven/grasps/blob/main/DESCRIPTION)
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 The goal of **grasps** is to provide a collection of statistical methods that