message: Force app-testsuite to create-react-app with npm
  When using yarn it takes longer to install the packages since
  it forces a full reinstall
diff: @@ -182,7 +182,7 @@ class App {
  public async create() {
  log('Creating react app');
  - await spawn('npx', ['create-react-app', this.appName], {
  + await spawn('npx', ['create-react-app', '--use-npm', this.appName], {
  cwd: this.testDir,
  stdio: 'inherit',
  shell,
  