Bump version to v2.2.1

Fix primary subtitle scaler (for image-based)

Fix our subtitle menu

Bump version to v2.2.0

Fix the smart secondary subtitle selector

Filter out "None tracks" with another rule

Refactor the subtitle downloader

Bump jszip from 3.4.0 to 3.7.0 (#51)

fix increase/decrease playback rate problem (#50)

fix: update popup menu selector and player container selector (#49)

Bump ssri from 6.0.1 to 6.0.2 (#48)

Bump y18n from 4.0.0 to 4.0.1 (#47)

Bump elliptic from 6.5.2 to 6.5.4 (#46)

Bump version to v2.1.2

Fix SubtitleFactory.isNoneTrack()