Update installation.md : add libpq-dev
Created by: GoZOo
libpq-dev is needed to build pg gem If not, this break : sudo -u git -H bundle exec rake gitlab:setup RAILS_ENV=production
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Created by: GoZOo
libpq-dev is needed to build pg gem If not, this break : sudo -u git -H bundle exec rake gitlab:setup RAILS_ENV=production