Use 'perl' explicitly as license in metadata

[paultcochrane]

The previous value, being a URL, did not conform to the META spec,
making the metadata invalid.

This change also fixes the core CPANTS issue: meta_yml_conforms_to_known_spec.

Hope this helps! If you want anything changed, just let me know and I'll update the PR as appropriate and resubmit.

[karpet]

Thanks.
I see that the metadata and README are out of sync. The README says GPL v2, which is probably wrong. The SWISH::3 module is GPL v2 because it compiles against libswish3, but that doesn't extend to libraries that include it.
If you patched README.pod too that would be ideal.

[paultcochrane]

Yes I just noticed the inconsistency myself. Other files also mention the GPLv2 explicitly, and since the Artistic License also allows the GPL, maybe everything should be licensed GPLv2? I'll definitely patch the README and update the PR.

[paultcochrane]

Oops, and there are files explicitly licensed as per the terms for Perl. Which would you like to have? Once I know, I can update the license sections and submit a PR for that change.

[karpet]

Yeah, the license stuff is a definite mess.

Let's go Perl. The bulk derives from SWISH::Prog which was Perl license, and there are no XS/C components like SWISH::3 has.

Thank you!

[paultcochrane]

No worries :-)

[paultcochrane]

Actually, as a completely separate issue, would you like me to migrate the dist to Dist::Zilla? The main reason being that Module::Install is officially deprecated and Dist::Zilla would allow you to create such things as the new META.json file automatically and can potentially do many other things. My Dist::Zilla-foo is still fairly basic, however I could give it a go if you'd like.

[karpet]

Sure that sounds reasonable - thank you.

[karpet]

Looks like a search/replace for s/it under the terms of the GPL v2 or later/it under the terms of the Perl Artistic license/g would do it.