v0.2.0

Added

• ffmpeg now needed for both decoding audio and filtering
• It is not included (install however you like!), but will cause errors if it is missing

Changed

• Bandpass logic now using a complex filter in ffmpeg instead of sox
• Decode also using ffmpeg, which should support more audio encodings than sox
• Change to use ffmpeg motivated by it being more common and having ready static builds

Removed

• No more sox dependency