Making a new release

Build documentation and then commit changes:

$ cd docs
$ sphinx-apidoc -f -o _source -e  ../mapmaker
$ make html

Update __version__ in mapmaker/__init__.py and pyproject.toml.
Update the package name in README.rst to reflect the new version.
Update README.rst with any changed usage instructions.
Commit mapmaker/__init__.py, README.rst and pyproject.toml.

With the new version identifier:

$ git tag VERSION
$ git push origin
$ git push origin VERSION
# We don't want untracked files bundled into the release
$ git stash --include-untracked
$ poetry build --format wheel
$ git stash pop

On Github, at https://github.com/dbrnz/flatmap-maker/releases/new, create a release using the new VERSION tag and upload the generated wheel to it.
Update __version__ in mapmaker/__init__.py to reflect we are now back in development mode.