Demo update notes for v0.31

[p]Truck City v0.31-Demo has just been released. This is the change log:[/p]

• [p]Improvement: yielding on roundabouts implemented[/p]
• [p]Improvement: two way roads yield when merging into one-way roads[/p]
• [p]Improvement: n-phase traffic lights exclude outbound one-way roads from arbitrage[/p]
• [p]Improvement: snap to grid algorithm improved for road placement[/p]
• [p]Improvement: truck window now reports status when yielding or waiting for a traffic light[/p]
• [p]Bugfix: one way roads next to single tile two way roads may incorrectly assume they are disconnected[/p]
• [p]Improvement: minor improvements on translations[/p][p][/p]