Normalize ProtonMail addresses
Normalize ProtonMail addresses

ProtonMail addresses are handled exactly like Gmail's (dots don't
matter, has support for the `+something`) so they can be
normalized in the same way.

arex1337/lila,arex1337/lila,luanlv/lila,arex1337/lila,luanlv/lila,luanlv/lila,luanlv/lila,arex1337/lila,arex1337/lila,arex1337/lila,luanlv/lila,luanlv/lila,arex1337/lila,luanlv/lila