One more version where CLion integration is broken 
Have to generate stuff manually again.
Still getting the following with 4.20 Preview 1:
/Users/Shared/Epic_Games/UE_4.20/Engine /Users/Shared/Epic_Games/UE_4.20/Engine/Binaries/Mac
ERROR: UnrealBuildTool Exception: Unhandled project file type 'CLion
Aaaaand the fix is scheduled for 4.21…