Upgrade license

[manuelaugustin]

Hi @gerad

Thanks for making the JavaScript versions of the snowball stemmers available on GitHub! We'd like to use one of these stemmers for our software project.

Our software project is an open-source project licensed under GPL. You can find it here: https://github.com/Yoast/javascript.

Unfortunately, the Mozilla v.1.1 license used for the data in your project isn't compatible with GPL. Would you perhaps consider upgrading the license of your data to the MPL 2.0 license? That license is compatible with GPL, see https://www.gnu.org/licenses/license-list.en.html#MPL-2.0

Changing the license to MPL 2.0 would open up the data for wider usage in open source software development, so I'm sure many others would benefit from it as well.

Best,
Manuel