v0.4.0

What's Changed

• implement countdown timer by @race604 in #17
• 9ef4575 update README for countdown mode
• f3e58a6 support H:M format in countdown
• 1215037 pad zeros to keep width in consistent
• 3c1b0c1 fix bug in parsing color name
• 75e7de9 support millis option for countdown timer

Full Changelog: v0.3.2...v0.4.0