Version 2.0.0 - update of everything

tests/dev/update.check.js

@@ -0,0 +1,5 @@
+const { isolateData, req } = require('./_setup');
+isolateData('upd');
+const ytdlp = req('src/youtube/ytdlp');
+const a = ytdlp.update({ reason: 'test' }), b = ytdlp.update();
+a.then(r => console.log('single-flight:', a === b, JSON.stringify({ ok: r.ok, updatable: r.updatable, before: r.before, after: r.after, message: r.message })));