完整的警告是：
Warning: React does not recognize the computedMatch prop on a DOM element. If you intentionally want it to appear in the DOM as a custom attribute, spell it as lowercase computedmatch instead. If you accidentally passed it from a parent component, remove it from the DOM element.

版本：

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"react": "^16.8.6",
"react-dom": "^16.8.6",
"react-redux": "^7.0.3",
"react-router-dom": "^5.0.1",

引起警告的原因是： 在react-router-dom的<Switch>中使用了<div>

解决办法很简单，把<Switch>增加一层<Fragment>就行了

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render() {
    return (
      <Switch>
+       <Fragment>
        <div className="App">
          <header className="App-header">  
            <Link to='/'>Home</Link>
            <Link to='/about'>About</Link>
            <Link to='/users'>Users</Link>
            <Route exact path='/' component={Index} />
            <Route exact path='/about' component={About} />
            <Route exact path='/users' component={Users} />
          </header>
        </div>
+       </Fragment>
      </Switch>
    )