Add postgresql-contrib to dependencies.md
Add postgresql-contrib to dependencies.md

Chocobozzz/PeerTube,Green-Star/PeerTube,Green-Star/PeerTube,Chocobozzz/PeerTube,Chocobozzz/PeerTube,Green-Star/PeerTube,Chocobozzz/PeerTube,Green-Star/PeerTube