OptDir-0.0.4: README.md

OptDir
======

[![Build Status](https://travis-ci.org/msakai/haskell-optdir.svg?branch=master)](https://travis-ci.org/msakai/haskell-optdir)
[![Hackage](https://img.shields.io/hackage/v/OptDir.svg)](https://hackage.haskell.org/package/OptDir)
[![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)

The OptDir type for representing optimization directions.