Update notes for v1.0.8

[p]Truck City v1.0.8 has just been released. This changelog also includes changes made in v1.0.7:[/p]

• [p]Feature: added option to enable or disable screen border mouse scroll (thank you Earth McFlat)[/p]
• [p]Improvement: completed missions show up in green in the menu (thank you Earth McFlat)[/p]
• [p]Improvement: added translation for mission mode scenarios[/p]
• [p]Balance: lowered cost of Quantum science production buildings 500 to 400[/p]
• [p]Improvement: increased width of cargo selection in truck window[/p]
• [p]Bugfix: regression bug corrected where leaderboard button was not enabled after returning to main menu from a game[/p]