 * Add Bulgarian translation (thanks StoyanDimitrov)
 * Fix short description in F-Droid (thanks linsui)
 * Fix typo (thanks GPery and DeenHyper74)
 * A different notification for each installed app will be displayed
 * Clicking on notification will update the app
 * Better detect ABI of device - Firefox Focus can be installed on Android emulators
 * Use Crasher (https://github.com/fennifith/Crasher) for crash reports
 * Delete old downloaded APK files more reliable
 * Drop permission READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE because they should not be necessary
 * Check and fail if external storage is not available
 * Query GitHub API with less network traffic
 * Cleanup code