我试图在Laravel 6.2中安装作曲家，要求“ laravelcollective / html”：“ ^ 5.4.0” 。 composer.json是：

 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>
<section>
  <div class="container-fluid pt-70 pb-0">
  <div class="container">
    <div id="myCarousel" class="carousel slide" data-ride="carousel">
  <?php foreach ($gallery_imgs as $img):?> 
      <div class="carousel-inner">
        <div class="item">
          <img src="<?php echo base_url(); echo $img['thumbnail_url']; ?>" alt="Los Angeles" style="width:30%;">
        </div>
      </div>
    <?php endforeach;?>

      <!-- Left and right controls -->
      <a class="left carousel-control" href="#myCarousel" data-slide="prev">
        <span class="glyphicon glyphicon-chevron-left"></span>
        <span class="sr-only">Previous</span>
      </a>
      <a class="right carousel-control" href="#myCarousel" data-slide="next">
        <span class="glyphicon glyphicon-chevron-right"></span>
        <span class="sr-only">Next</span>
      </a>
    </div>
  </div>
  </div>
</section>

但是，出现以下错误：

"require": {
    "php": "^7.2","fideloper/proxy": "^4.0","laravel/framework": "^6.2","laravel/tinker": "^1.0"

是因为该命令不支持最新版本的laravel吗？因为我发现的最新命令是v5.8。如果是，我有什么办法可以将laravel 6.2版本替换为旧版本？