Merge pull request #29 from RevolutionUC/gulp-4

Update build runners to gulp v4 (#28)

Hotfix: Update doctype

Remove this hack when SparkPost/heml@5845ee4 is released

Update mailing address in footer

Update for RevUC Spring 2019

Bump to v2.3.0

Add spring 2018 confirm attendance email

Add spring 2018 first info email template and content

Update master template

  - Use the `<preview>` tag only when a shortDescription is given
    (MailChimp appends it's own description, so this tag is needed
     only for transactional emails)
  - Update styling on button - add more top and bottom margin

Merge v2 into master (#25)

Overhaul for v2.0.0 (RevolutionUC Spring 2018). Changes include:

- Leaner code
- New utilities for developing
- Design tweaks (colors and layout)
- Now using heml+nunjucks for templating (previously Inky+nunjucks)

Bump to v1.1.9