refactor to work with Gulp 4 #8
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Based on https://www.sitepoint.com/automate-css-tasks-gulp/
https://gulpjs.com/docs/en/getting-started/quick-start
https://gulpjs.com/docs/en/getting-started/creating-tasks
https://gulpjs.com/docs/en/getting-started/async-completion
consulted 2019-06-17 as well as the Udacity course materials
https://classroom.udacity.com/nanodegrees/nd001/parts/20f5a632-38e6-48e7-88c8-e14c21590bb9/modules/de442af7-4ae2-48d7-a613-cf132eeaf60c/lessons/5831481034/concepts/55096392250923