ogv.js 1.5.7 released

I’ve released ogv.js 1.5.7 with performance boosts for VP8/VP9 video (especially on IE 11) and Opus audio decoding, and a fix for audio/webm seeking.

npm: https://www.npmjs.com/package/ogv
zip: https://github.com/brion/ogv.js/releases/tag/1.5.7