Remove myself as maintainer

Author: thomashoneyman

README.md

@@ -3,7 +3,6 @@
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-[![Maintainer: thomashoneyman](https://img.shields.io/badge/maintainer-thomashoneyman-teal.svg)](http://github.com/thomashoneyman)
 
 [Argonaut](https://github.com/purescript-contrib/purescript-argonaut) is a collection of libraries for working with JSON in PureScript. `argonaut-codecs` provides codecs based on the `EncodeJson` and `DecodeJson` type classes, along with instances for common data types and combinators for encoding and decoding `Json` values.