added entry for gulp-json-editor and a fix for Nodev12 for graceful-fs
added entry for gulp-json-editor and a fix for Nodev12 for graceful-fs

graceful-fs has an issue on Node v12 so we had to add a fix with resolutions
refer: https://stackoverflow.com/questions/55921442/how-to-fix-referenceerror-primordials-is-not-defined-in-node/58394828#58394828

PubMatic/OpenWrap,PubMatic/OpenWrap,PubMatic/OpenWrap,PubMatic/OpenWrap