Wont accept my config values

[plasmoduck]

Hi, in my config I've set:

rules:

• window-class: tabbed
  flash-on-focus: False

Which flashfocus does not like. It fails to start and gives me:

flashfocus.errors.ConfigLoadError: Error encountered in config file. Check that your config file is formatted correctly.

Commenting out those 3 lines it works again.