v1.3.0

Added

• Keybind ,: change speed by -1.
• Keybind .: change speed by +1.
• Keybind <: change speed by -10.
• Keybind >: change speed by +10.
• Option -b/--bg-color: background color (optional, by default transparent).

Fixed

• Lighten rather than darken if pipe piece color is < than the --darken-min value.
• Fix invalid handling of --max-drawn-pieces = 0.