Satisfactory uses now a new UE version

[Flachdachs]

The calls of umodel.exe in the section "Updating icons" of the README.md use a parameter -game=ue4.22. When these commands are executed in a Windows Powershell they will stop with an error 'ERROR: unknown game tag "ue4".' The parameter value needs to be quoted.

Additionally, the game uses UE version 4.25 since update 5. So this parameter needs to be changed to -game="ue4.25". When called with the old version number it will be aborted with an "assertion failed" error.

[greeny]

Yeah the readme wasn't updated for a long time. I'll probably have to update it at some point with new info anyway.