Release process

Pre-release

Pick a new version number (e.g. X.Y.Z)
Update CHANGELOG with that number
Update setup.py with that number

Smoke-testing

Run
```
$ python setup.py install --user
```
Check ~/.local/bin/generate-dashboard for the update version.
Try the example on README.

Releasing

Head to https://github.com/weaveworks/grafanalib/releases/new and create the release there.
Wait for GitHub Actions to complete the build and release.
Confirm on https://pypi.org/project/grafanalib/ that the release made it there.

Follow-up

Run
```
$ pip intall grafanalib -U
```
Check if the upgrade worked and the test above still passes.