revert package.json

Author: GoodDayForSurf

packages/devextreme-cli/testing/dev-server.js

@@ -32,7 +32,7 @@ module.exports = class DevServer {
                 // https://github.com/facebook/create-react-app/issues/3657
                 env: Object.assign(process.env, { CI: false })
             });
-            await runCommand('ls', ['./dist/my-app/browser'], {
+            await runCommand('cat', ['./dist/my-app/browser/index.html'], {
                 cwd: this.env.appPath,
             });