* upstream/master: (372 commits)
Enable Lint/StringConversionInInterpolation cop and autocorrect offenses
resolve duplicated changelog entry
credit myself 😄
change determine conditions
override subject method in devise mailer
follow the styleguide: Don't use parentheses around a literal
wrap subject with method subject
move spec back into shared example `an email sent from GitLab`
stub config settings in spec
remove empty line at block body end
remove extra entry
create new test in `spec/mailers/notify_spec.rb`
move changelog to 8.13
add configurable email subject suffix
Fixes sidebar navigation.
Convert "SSH Keys" Spinach features to RSpec
Enable import/export back for non-admins
Update gitlab-shell to 3.6.3
Updated artwork of empty group state.
Better empty state for Groups view.
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