title: Find and version bump outdated packages in Flutter (across major versions)
body: <p>Is there a way to list and update packages that have crossed a major version in pubspec.yaml? (like this <a href="https://stackoverflow.com/questions/41103367/how-can-i-version-bump-all-my-dependencies">method used in NPM</a>)</p>
  
  <p>E.g. when the pubspec.yaml file has this with <code>built_value</code>:</p>
  
  <pre><code>dependencies:
    flutter:
      sdk: flutter
    built_value: ^5.0.0
  </code></pre>
  
  <p>When <code>built_value</code> is updated to version <code>^6.2.0</code> is there a way to upgrade past the major version so the pubspec.yaml is updated to:</p>
  
  <pre><code>dependencies:
    flutter:
      sdk: flutter
    built_value: ^6.2.0
  </code></pre>
  
  <p>I know I can manually check each package for major versions, but it would be helpful if it was automatic.</p>