Update notes for v0.48

[p]Truck City v0.48 has just been released. This is the change log:[/p]

• [p]Feature: Sandbox mode now allows configuring the initial amount of money[/p]
• [p]Improvement: added new factory icons to Alt mode[/p][p][/p]
• [p]Improvement: newly built factories immediately show overlays depending on Alt mode configuration[/p]
• [p]Improvement: adjusted factory Alt mode overlay and shadows[/p]
• [p]Improvement: right click drag camera rotation made smoother[/p]
• [p]Improvement: minor efficiency improvements[/p]