v3.0.0

Massive reorganization with automated testing and config files instead of environment variables. Looking to the future of TranscodeBot as not just a tool to compress movies for Plex, but rather a generic automated transcode pipeline that can be fit in a variety of workflows.

What's Changed

• ensure input exists and other spelling issue by @lemonjesus in #30
• add rubocop and a CI step by @lemonjesus in #32
• use config file instead of environment variables by @lemonjesus in #29
• use a new ruby base image by @lemonjesus in #33
• don't blow up on videos with no audio by @lemonjesus in #36
• add automated tests by @lemonjesus in #38

Full Changelog: v2.2.1...v3.0.0