Update README.md

Author: nsaunders

README.md

@@ -5,6 +5,7 @@
 [![Pursuit](https://pursuit.purescript.org/packages/purescript-css/badge)](https://pursuit.purescript.org/packages/purescript-css)
 [![Maintainer: garyb](https://img.shields.io/badge/maintainer-garyb-teal.svg)](https://github.com/garyb)
 [![Maintainer: thomashoneyman](https://img.shields.io/badge/maintainer-thomashoneyman-teal.svg)](https://github.com/thomashoneyman)
+[![Maintainer: nsaunders](https://img.shields.io/badge/maintainer-nsaunders-teal.svg)](https://github.com/nsaunders)
 
 A type-safe library for describing, manipulating, and rendering CSS.