Version 4.0.9 is available

This release brings only fixed bugs for stable release. Binaries are available for Linux and Windows (both 64-bit). For more info how to use AppImage on Linux, please see: https://docs.appimage.org/user-guide/run-appimages.html. Below are changes since the last stable release (this time list is a bit longer than last):

Fixed

• Info about setting difficulty level of upgrades costs
• Adding non existing ships to the game statistics
• Crash on finishing missions in bases
• Hang on starting a new game