Releasing

Check that CI is green.

Double check that code linter and tests pass:

make lint-docker
make test SHELL=bash  # if on macOS
make test SHELL=zsh   # if on macOS
make test-docker

Update CHNODE_VERSION:
```
$EDITOR chnode.sh
```
Summarize changes since the last release:
```
$EDITOR CHANGELOG.md
```

Review your changes, commit them, tag the release:

git diff
git add -p
git commit -m 'Release version $version'
git tag v$version
git push origin master v$version

Update Homebrew tap.