Code modernization

What's Changed

• Code modernization performed by @flacjacket, now latest versions of Python3 are supported
• New function Monoprice.all_zone_status() that returns a list of zone statuses for a monoprice unit

New Contributors

• @flacjacket made their first contribution in #7

Full Changelog: 0.3...0.4

0.3

Added support for asyncio

0.2

prepared release 0.2

First release

0.1

initial commit