docs: Update README.md to use now fixed FFmpeg

[Lockl00p]

Pull Request Template

Type of change

• Bug fix
• Feature
• Documentation update

Description

ramble here

Checklist

• any anime playing
• bumped version

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• next, prev and replay work
• -c history and continue work
• -d downloads work
• -s syncplay works
• -q quality works
• -v vlc works
• -e select episode works
• -S select index works
• -r range selection works
• --dub and regular (sub) mode both work
• all providers return links (not necessarily on a single anime, use debug mode to confirm)

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• -h help info is up to date
• Readme is up to date
• 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)