Don’t exclude some file in lib from rubocop

.rubocop.yml

lib/backup/database.rb

lib/backup/files.rb

lib/backup/manager.rb

lib/backup/repository.rb

lib/backup/uploads.rb

lib/gitlab/seeder.rb

lib/gitlab/upgrader.rb

lib/tasks/brakeman.rake

lib/tasks/cache.rake

lib/tasks/dev.rake

lib/tasks/downtime_check.rake

lib/tasks/flay.rake

lib/tasks/gemojione.rake

lib/tasks/gitlab/assets.rake

lib/tasks/gitlab/check.rake

lib/tasks/gitlab/cleanup.rake

lib/tasks/gitlab/db.rake

lib/tasks/gitlab/git.rake

lib/tasks/gitlab/import.rake