Update README

Author: urbanslug

README.md

@@ -3,7 +3,8 @@
 [![Test Status](https://github.com/pangenome/povu/actions/workflows/test.yml/badge.svg?label=tests)](https://github.com/pangenome/povu/actions/workflows/test.yml)
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-[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+![c++17](https://img.shields.io/badge/cpp-c%2B%2B17-informational)
+[![License: MIT](https://img.shields.io/badge/License-MIT-informational.svg)](https://opensource.org/licenses/MIT)
 
 A toolkit for exploring regions of genomic variation