Updates gulp in scaffolder from 3->4 because scaffolding code would not run in node v12+
NOTE: This commit causes the scaffold _package.json to use my fork of widgetbuilder-gulp-helper as a dependency instead of your version. I also submitted a PR in widgetbuilder-gulp-helper. Once you've accepted it and released v1.0.2, you should update _package.json to use your repo again.
Updates gulp in scaffolder from 3->4 because scaffolding code would not run in node v12+
NOTE: This commit causes the scaffold _package.json to use my fork of widgetbuilder-gulp-helper as a dependency instead of your version. I also submitted a PR in widgetbuilder-gulp-helper. Once you've accepted it and released v1.0.2, you should update _package.json to use your repo again.