Feature

• #26 - Feature: support for Game Coordinator protocol 5 (@TrueBrain)

Fix

• #31 - Fix 8bddee9: only use TURN when Game Coordinator protocol is 5+ (@TrueBrain)
• #30 - Fix 15ff189: also publish the "listing" stats (@TrueBrain)
• #28 - Fix: allow tracking-number zero to be used to stop the connection attempt (@TrueBrain)