downgrade gulp 4 to alpha 2 temporarily - https://github.com/gulpjs/gulp/issues/2065
downgrade gulp 4 to alpha 2 temporarily - https://github.com/gulpjs/gulp/issues/2065

localnerve/react-pwa-boilerplate,localnerve/react-pwa-reference,localnerve/react-pwa-boilerplate,localnerve/react-pwa-reference