message: More polyfills for IE11.
diff: // Polyfills. Mostly for IE11
  import 'core-js/es6/map';
  import 'core-js/es6/promise';
  -import 'core-js/fn/string/includes';
  -import 'core-js/fn/string/starts-with';
  +import 'core-js/es6/reflect';
  import 'core-js/fn/array/find';
  +import 'core-js/fn/array/includes';
  import 'core-js/fn/object/assign';
  -import 'core-js/es6/reflect';
  +import 'core-js/fn/string/ends-with';
  +import 'core-js/fn/string/includes';
  +import 'core-js/fn/string/starts-with';
  