[Snyk] Security upgrade gulp-uglify from 1.5.4 to 3.0.0#20

snyk-bot wants to merge 1 commit intomasterE-LLP/developer.github.com:masterfrom

snyk-fix-642f86d4f10dd3b140e3ea72bff75eedE-LLP/developer.github.com:snyk-fix-642f86d4f10dd3b140e3ea72bff75eedCopy head branch name to clipboard