trellis_test 0.2.1

# Change Log
All notable changes to this project will be documented in this file.
This project adheres to [Semantic Versioning](http://semver.org/).

## [Unreleased]

## [0.2.1]
- removed debug console logging
- documentation added

## [0.2.0]
### Added
- tests
- clear_led function to turn led off
- button_evt_loop function added to query trellis button states

## [0.1.0]
### Added
- turn a led on, on the trellis