gulp build fails with node >= 12

[josundt]

Despite the code of conduct exercised in conversations with contributors to this project (ref your response to my reported case #57), I would like to report that gulp build fails with current node LTS (>=12.x).

Reference: https://stackoverflow.com/questions/55921442/how-to-fix-referenceerror-primordials-is-not-defined-in-node

According to this article the best solution is to upgrade to gulp 4.