Add mail.proton.me to domain list

[vaindil]

I clicked through way too quickly and meant to open this PR on my own fork, but hey, getting it in here too would work. 😄 This adds mail.proton.me to the domain list since Proton seems to forcefully redirect you to there now.

[harryqt]

When trying to pack getting this error.

D:\projects\protonmail-webextension>npm run deploy

> protonmail-webextension@1.10.0 deploy
> node scripts/deploy.js

commit first

D:\projects\protonmail-webextension>

[vaindil]

@Dibbyo456 I uploaded builds for FF and Chrome to this issue: #23 (comment)

[mailueberfalln]

Please add mail.protonmailrmez3lotccipshtkleegetolb73fuirgj7r4o4vfu7ozyd.onion to domain list too and upload builds again. Thanks