Add MANIFEST.in to include LICENSE in distribution
Add MANIFEST.in to include LICENSE in distribution

From https://packaging.python.org/distributing/#manifest-in:
> A "MANIFEST.in" is needed in certain cases where you need to package
> additional files that python setup.py sdist (or bdist_wheel) don't
> automatically include.

sissaschool/xmlschema,brunato/xmlschema