title: Cannot find module '@typescript-eslint/parser' when using Prettier Eslint
body: <p>I'm getting the following error from Prettier Eslint Output on VSCode when saving the file.</p>
  <pre><code>Error: Cannot find module '@typescript-eslint/parser'
  Require stack:
  - c:\Users\vtnor\.vscode\extensions\rvest.vs-code-prettier-eslint-0.4.1\dist\extension.js
  - c:\Program Files\Microsoft VS Code\resources\app\out\vs\loader.js
  - c:\Program Files\Microsoft VS Code\resources\app\out\bootstrap-amd.js
  - c:\Program Files\Microsoft VS Code\resources\app\out\bootstrap-fork.js
  </code></pre>
  <p>My package json is:</p>
  <pre><code>[...]
  &quot;typescript&quot;: &quot;^4.2.2&quot;,
  &quot;@typescript-eslint/eslint-plugin&quot;: &quot;^4.16.1&quot;,
  &quot;@typescript-eslint/parser&quot;: &quot;^4.16.1&quot;,
  &quot;eslint&quot;: &quot;^7.21.0&quot;,
  &quot;prettier&quot;: &quot;^2.2.1&quot;,
  &quot;prettier-eslint&quot;: &quot;^12.0.0&quot;,
  [...]
  </code></pre>