title: composer update problem with ext-calender * is missing from your system
body: <p>Am trying to update composer dependencies on a Laravel application but getting this error</p>
  
  <blockquote>
    <p>Problem 1
        - The requested PHP extension ext-calender* is missing from your system. Install or enable PHP's calendar extension.</p>
  </blockquote>
  
  <p>in my composer.json file</p>
  
  <pre><code>{
      "require": {
          "php": "&gt;=7.2.0",
          "ext-json": "*",
          "ext-calender": "*",
      }
  }
  </code></pre>