Source licenses from "choosealicense"

[vadcx]

Github runs its own repository of machine-readable license templates at https://github.com/github/choosealicense.com, they are used by the Javascript-based tool there: https://github.com/generate/generate-license

The suggestion is to include their license repository instead of maintaining your own files (link to current folder)

This would solve #15 too.

The file format is simple and apparently doesn't require a parser, just need to remove the --- header definition containing metadata. Some licenses contain placeholders, others don't, I think that's their format file for placeholders: _data/fields.yml. A couple potential fields are missing from the current license-generator.

[atomicptr]

The SPDX might be a better resource: https://spdx.org/licenses/

Quite a few projects use the license list and identifier from it