Morel release 0.5.0

This is a source or binary distribution of Morel.

Changes since the previous release are described in the
HISTORY.md file.

The LICENSE and NOTICE files contain license information.

If this is a source distribution, you can find instructions how to
build the release in the "Building" section in README.md.

Further information about Morel is available at its web site,
https://github.com/hydromatic/morel.
