Change license

[dpc]

I'm planing to migrate to:

license = "MPL-2.0 OR MIT OR Apache-2.0"

everywhere. Just to give people more choice. I did in digest crates already, before releasing.

@Dylan-DPC @rffrancon . Ack? :)

[Dylan-DPC-zz]

do we need to triple license it? i think MIT or Apache-2.0 is enough given how widely it is used in the rust community.

[dpc]

MPL-2 is my favorite, and it doesn't hurt to just have them all ORed. That works as anyone can pick the one that fits them best.

[ffranr]

ACK, from my point of view, the more options the better. :)

[dpc]

I went ahead, and fixed last project that was still at MPL-2.0. If anything is wrong, please let me know. :)

[zachaysan]

This is great, but you should make a LICENSE file explicitly so people looking at the project can see it. Or at least add it to the README.

[Bert-Proesmans]

A LICENCE file is best. Github parses the file to give a quick overview of rights and obligations, as well as tagging the entire repo with the licence.