title: Difference between listing vs assigning true value to a rule in linter
body: <p>Listing a key:</p>
  <pre class="lang-dart prettyprint-override"><code>linter:
    rules:
      - omit_local_variable_types
  </code></pre>
  <p>vs</p>
  <p>Assigning <code>true</code> to key:</p>
  <pre class="lang-dart prettyprint-override"><code>linter:
    rules:
      omit_local_variable_types: true
  </code></pre>
  <p>Both seems to do the same job. Is there any difference between these two ways?</p>