Update README.md

Author: ncullen93

README.md

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-<!--
-![ants brain](http://i.imgur.com/I2VNWpA.png)
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 # Advanced Normalization Tools in R
 
+[![R-CMD-check](https://github.com/ANTsX/ANTsR/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/ANTsX/ANTsR/actions/workflows/R-CMD-check.yaml)
 ![Downloads](https://img.shields.io/github/downloads/antsx/antsr/total)
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/stnava/ANTsRDocker/master)
 [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-v2.0%20adopted-ff69b4.svg)](code_of_conduct.md)