Please add LICENSE to sdist tarball

[mimi1vx]

This will help for distributions in packaging .

[nbraud]

@mimi1vx Why would shipping a copy of the LGPL text in the sdist tarball help with packaging? In all distributions I've packaged for (Debian, Exherbo, FreeBSD, ...), the package simply needs to declare (within machine-readable metadata) what is the license.

The LGPL itself requires redistributed copies to be accompanied with a copy of the license, but:

1. this is much better done by pointing at a common copy, e.g. /usr/share/common-licences/LGPL-3.0 on Debian, than by shipping a million copies of that text;
2. the LGPL requires distributing its own text and the GPL text (which it refers to and amends), whereas LICENSE currently only contains the LGPL's text.