proton-mail: change download url

[traktuner]

Since the Proton Mail desktop app is now on version 1.1.0 and GitHub releases only show versions up to 1.0.6, I thought it would be good to change the download url to the non-versioned one which is hosted on proton.me
Unfortunately, there is no versioned url available.

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[krehel]

Hey @EpokK and @flavienbonvin! Apologies for the tag here, but seems the GitHub version of proton-mail is a bit behind Proton's site - should we pivot to using the version directly from Proton?

Also a note in case this 1.1.0 version is supposed to be on GitHub and somehow didn't make it!

Thanks so much!

[samford]

Makes sense to me. Thanks!