Running MJML rendering on Zeit Now

See this issue, for the error when trying to import the mJML library into a project and deploying to Zeit Now.

Using the rolliup.config.js of this repo, as an intermediate step seems to resolve the issue.

Please note, that I'm not exactly sure why this works, I just arrived to this setup via trial and error!

So the steps to run your MJML project on Zeit:

1. rollup -c
2. ncc build bundle/date.js => this step will soon no longer be necessary when Zeit updates the ncc library used on their deploys
3. now