v0.4.0

Fixed

• The encoder functions will now encode empty input into a single 0x01 byte.
  #49

Changed

• Bumped defmt dependency to v1
  #51
• decode now returns the DecodeReport structure which contains both the frame size
  and the parsed size.
  #50
• CobsDecoder::push also returns a DecodeReport now.
  #50
• The DecodeReport structure now has frame_size and parsed_size getter methods instead
  of public src_used / dst_used fields.
  #50
• The CobsDecoder is now able to continuously parse data without having to re-create
  it after each parsed packet.
  #50