Update notes for v1.2.2

[p]Truck City v1.2.2 has just been released. This is the changelog:[/p]

• [p]Feature: added tips to loading screens[/p]
• [p]Bugfix: fixed bug that would cause a truck to collect a container of an item not in the "Allowed items" list (thank you HELLFIRE!)[/p]
• [p]Bugfix: fixed alt mode overlay minor bug[/p]