refactor: update polyfills file to match latest template
refactor: update polyfills file to match latest template

Copied from https://github.com/angular/angular-cli/blob/master/packages/schematics/angular/application/files/src/polyfills.ts.template

Chan4077/angular-rss-reader,Chan4077/angular-rss-reader,Chan4077/angular-rss-reader