Note: Regenerator problem running Karma tests when importing hub.js >= 9.13.2

[MikeTschudi]

solution.js imports hub.js. Builds are successful with all hub.js versions, but the Karma tests when importing 9.13.2, 9.14.1, and 9.15.0 all failed with:

The solution.js Karma tests succeed with hub.js 9.12.0.

Note that the Karma tests in hub.js on the same computer worked for every version.

The solution.js Karma tests succeed with the later hub.js versions after adding "regenerator-runtime": "^0.13.9" to the package.json.