Invalid SPDX expression for license in package.json (Prevents license compatibility checks from working correctly)

[johanna-herrmann]

In your package.json the value of the license field/property is "SEE LICENSE IN README".
This is not a valid SPDX expression.
This prevents license compatibility checks from working correctly.
Example: For projects with MIT License scss-parser is reported to use the incompatible license "SEE LICENSE IN README".

I would appreciate to see a fix on this issue (e. g. using valid SPDX for license).

Thanks in regard