v0.1.9-beta

FIXED CRITICAL BUG - getting GitHub release info was broken.

GitHub changed their website to load asset info dynamically with JavaScript, so this info could no longer be scraped via the website. Instead, Obtainium now uses the GitHub API, which is rate limited to around 60 requests every 30 minutes. This should be enough for daily use but users with many Apps will be told to wait when the rate limit is reached.