[Snyk] Security upgrade express from 4.16.2 to 4.21.2#53

strues wants to merge 1 commit intomasterstrues/react-universal-boiler:masterfrom

snyk-fix-0d021f8facc2256245086ad430eb3edestrues/react-universal-boiler:snyk-fix-0d021f8facc2256245086ad430eb3edeCopy head branch name to clipboard