The source project of this merge request has been removed.
Loosen dependencies on mime-types versions.
As discussed in gitlab-org/gitlab-ce#15101, we need to upgrade gitlab-grit to allow newer versions of mime-types if we want to use them in GitLab CE.
Changelog for mime-types: https://github.com/mime-types/ruby-mime-types/blob/master/History.rdoc
cc: @dzaporozhets