XF2 Addons Add-on Update Notifier 1.1.7

🔔 Alerts for when addons have new version that can be installed

• addon.json metadata now has some useful links, thanks @otto
• possibility to ignore the current newest version
  • When a newer version is released it will still notify you about the newer version
  • Less clutter in admin/addon if you don't e.g. want to update to a specific version