piston2d-drag_controller 0.0.3

A drag controller
drag_controller [![Build Status](https://travis-ci.org/PistonDevelopers/drag_controller.svg)](https://travis-ci.org/PistonDevelopers/drag_controller)
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A drag controller

[How to contribute](https://github.com/PistonDevelopers/piston/blob/master/CONTRIBUTING.md)