Expected an assignment or function call and instead saw an expression no-unused-expressions ReactJS

Question

I'm new to react and this is my first application.I'm having this error... I saw some possible duplicates in stackoverflow.but those answers not solve this problem

./src/components/app/App.js Line 7:5: Expected an assignment or function call and instead saw an expression no-unused-expressions

Code

import React, {Component} from 'react';
import 'bootstrap/dist/css/bootstrap.min.css';

class App extends Component{
  render(){
    return 
    (
      <div className="container">
        <h2>react.......</h2>
      </div>
    );

  }
}

export default App;