downgrade electron-builder to 19.4.1 and electron-builder-squirrel-windows to 19.4.0 to fix missing package.json on build
downgrade electron-builder to 19.4.1 and electron-builder-squirrel-windows to 19.4.0 to fix missing package.json on build

risetechnologies/meteor-electron-builder,risetechnologies/meteor-electron-builder