Update notifications (Core, OS, Addons, HACS, etc)

[auanasgheps (Oliver)]

Hey everyone! If you're still interested in using this blueprint, check out my updated version!
I fixed all the broken things, and added some improvements.

Update notifications for Home Assistant

Get notified whenever there's an update in Home Assistant; check the changelog, update or skip. [Open your Home Assistant instance and show the blueprint import dialog with a specific blueprint pre-filled.] This is an evolution of this blueprint, which hasn't received updates in ages. I have only updated it, but the original author has to be credited for the idea and most of the initial work. This version fixes all the issues I have found and introduces several enhancements. R…