Release v0.9

✨ New Features

• 8b6b021 - add release checksums (commit by @dpolakovics)
• ec572b8 - add 7.1.2 possibility (commit by @dpolakovics)

🐛 Bug Fixes

• 2f2bc04 - an issue where ffmpeg throws 234 when trying to add a cover image to wav (commit by @dpolakovics)