What would you like to be added: Please add support for SPDX

Why is this needed: There is an ecosystem of open source projects that have adopted this format, and it would be great to let this community be able to work with your tools as well.

Additional context:
Details on the format can be found at: https://spdx.github.io/spdx-spec/
Happy to work with anyone interested in doing the port, I just lack the "go" programming chops to submit a PR in myself.