Ensure `dblink` is installed for `ruby-db-tool`
Ensure `dblink` is installed for `ruby-db-tool`

Dockerized `postgresql:9.4` doesn't have it installed by default.

benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles