mtl-2.2.2: README.markdown

The `mtl` Package  [![Hackage](https://img.shields.io/hackage/v/mtl.svg)](https://hackage.haskell.org/package/mtl) [![Build Status](https://travis-ci.org/haskell/mtl.svg)](https://travis-ci.org/haskell/mtl)
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See [`mtl` on Hackage](http://hackage.haskell.org/package/mtl) for more information.