Release Checklist

• Set toyplot.__version__ to the correct release version number "X.Y.Z" in toyplot/__init__.py, using semantic versioning.
• Update docs/release-notes.rst.
• Update docs/features.rst.
• Run python regression.py to ensure all tests pass.
• Run python docs/build.py clean followed by python docs/build.py to ensure all notebook-based documentation is up-to-date.
• Update the classifiers and description in setup.py.
• Commit the release changes with commit message "Toyplot version X.Y.Z".
• Push the release commit.
• Tag the release commit with git tag -a vX.Y.Z -m "Toyplot version X.Y.Z"
• Push the release tag with git push origin vX.Y.Z
• Add release notes in github.
• Build the new source release: python setup.py sdist
• Upload the source release to PyPi: python -m twine upload --repository pypi dist/toyplot-X.Y.Z.tar.gz
• Bump toyplot.__version__ to a new development version number "X.Y.Z-dev".
• Remove any features that were deprecated in the new release.
• Post details to gitter.