bl4n [1] filed a deletion request for mattermost [2]: As mattermost is now in community repository, it makes a conflict while updating. Check here: https://www.archlinux.org/packages/community/x86_64/mattermost/
I think it would be nice to change the name or delete this package. [1] https://aur.archlinux.org/account/bl4n/ [2] https://aur.archlinux.org/pkgbase/mattermost/
