docs: Update README.md to use now fixed FFmpeg

[Lockl00p]

Pull Request Template

Type of change

• [ ] Bug fix
• [ ] Feature
• [X] Documentation update

Description

ramble here

Checklist

• [X] any anime playing

• [ ] bumped version

• [X] next, prev and replay work
• [X] -c history and continue work
• [X] -d downloads work
• [X] -s syncplay works
• [X] -q quality works
• [X] -v vlc works
• [X] -e select episode works
• [X] -S select index works
• [X] -r range selection works
• [X] --dub and regular (sub) mode both work

• [X] all providers return links (not necessarily on a single anime, use debug mode to confirm)

• [X] -h help info is up to date
• [X] Readme is up to date
• [X] Man page is up to date

Additional Testcases

• The safe bet: One Piece
• Episode 0: Saenai Heroine no Sodatekata ♭
• Unicode: Saenai Heroine no Sodatekata ♭
• Non-whole episodes: Tensei shitara slime datta ken (ep. 24.5, ep. 24.9)