Include license file in manifest.
Include license file in manifest.

This makes the source distribution to include the LICENSE file.

indygreg/python-zstandard,indygreg/python-zstandard,indygreg/python-zstandard,indygreg/python-zstandard,terrelln/python-zstandard,terrelln/python-zstandard,terrelln/python-zstandard,terrelln/python-zstandard