[skip-ci] Update license

Author: mhesselbarth

README.Rmd

@@ -15,7 +15,7 @@ knitr::opts_chunk$set(
 
 | Continuous Integration                                                                                                                                     | Development                                                                                                                        | CRAN                                                                                                                    | License                                                                                                     |
 |------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------|
-| [![R build status](https://github.com/r-spatialecology/shar/workflows/R-CMD-check/badge.svg)](https://github.com/r-spatialecology/shar/actions)            | [![Project Status](https://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/#active)                       | [![CRAN status](https://www.r-pkg.org/badges/version/shar)](https://cran.r-project.org/package=shar)                    | [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) |
+| [![R build status](https://github.com/r-spatialecology/shar/workflows/R-CMD-check/badge.svg)](https://github.com/r-spatialecology/shar/actions)            | [![Project Status](https://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/#active)                       | [![CRAN status](https://www.r-pkg.org/badges/version/shar)](https://cran.r-project.org/package=shar)                    | [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0) |
 | [![Coverage status](https://codecov.io/gh/r-spatialecology/shar/branch/main/graph/badge.svg)](https://codecov.io/gh/r-spatialecology/shar?branch=main) | [![Lifecycle: stable](https://img.shields.io/badge/lifecycle-stable-brightgreen.svg)](https://www.tidyverse.org/lifecycle/#stable) | [![CRAN logs](http://cranlogs.r-pkg.org/badges/grand-total/shar)](http://cran.rstudio.com/web/packages/shar/index.html) |                                                                                                             |
 
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