Update README.md

Author: jamesdbrock

README.md

@@ -2,6 +2,7 @@
 
 [![Latest release](http://img.shields.io/bower/v/purescript-bigints.svg)](https://github.com/sharkdp/purescript-bigints/releases)
 [![Build Status](https://github.com/sharkdp/purescript-bigints/workflows/CI/badge.svg?branch=master)](https://github.com/sharkdp/purescript-bigints/actions?query=workflow%3ACI+branch%3Amaster)
+[![Maintainer: gbagan](https://img.shields.io/badge/maintainer-gbagan-teal.svg)](https://github.com/gbagan)
 
 A library for calculations with arbitrary length integers.
 This is a simple wrapper around [BigInteger.js](https://github.com/peterolson/BigInteger.js)