Feature request: Subject Alternative Names support

[bryhall]

This is a great add-on! I have been using a PowerShell script with Posh-ACME module to request and renew Lets Encrypt certs, but I still need to manually upload the cert files. One of my HASS instances uses Let's Encrypt with a second SAN. This add-on seems like it would help by automatically renewing my Lets Encrypt cert and adding it to HASS, but in my scenario, I would also need a SAN as well. Would it be possible to add SAN support to this add-on?

I use this add-on for another HASs instance that doesn't need a SAN, and it works great!