Add repository field to license

[troppmann]

Hey,
i realy like this tool. I also wanted to show the URL of the repository of each license.
The output includes now the URL as string of the repository.

[sstadick]

Thanks for the PR! I think I like the change, I just need to think about about how it might break existing installs / THIRDPARTY files and I haven't looked at the code in a bit.

If you had thoughts on that I'd be interested! I suppose a majore version bump could cover it.

[troppmann]

There are 2 possible solutions i thought of.
First is to add the #[serde(default)] to the repository field this will parse old THIRDPARTY files without problems.
Second is to make the repository field an Optional<String>.
The first solution is more simple. The second solution should be used when an additional command flag is added to enable/disable the repository field.
I added #[serde(default)] for now, now it can parse the THIRDPARTY.yml file.

[sstadick]

I'm bumping the major version right now anyways, so I'm pulling this in.