Update README.md

Author: garyb

README.md

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 [![Latest release](http://img.shields.io/github/release/purescript-web/purescript-web-uievents.svg)](https://github.com/purescript-web/purescript-web-uievents/releases)
 [![Build status](https://travis-ci.org/purescript-web/purescript-web-uievents.svg?branch=master)](https://travis-ci.org/purescript-web/purescript-web-uievents)
-[![Maintainer: garyb](https://img.shields.io/badge/maintainer-garyb-lightgrey.svg)](http://github.com/garyb)
 
 Type definitions and low level interface implementations for the W3C UI events spec.