[Question] How to change the licence from Apache-2.0 to GPL-3.0-only ?

When I used the command nbdev_new it created a settings.ini with `license = apache2.`, How can I change it to GPL-3.0-only ?

And why is the[ SPDX short identifier](https://spdx.org/licenses/) not used?

Start with the nbdev_new entry point and inspect how it creates settings.ini and records the license value. Compare the documented license options with the SPDX short identifier question; done means the documentation clearly explains whether GPL-3.0-only is supported and why the current identifier is used.

Written by the indexing model from the issue text.