title: Trying parse-server-mailgun
body: <p>I am trying to follow this document:
  <a href="https://www.npmjs.com/package/parse-server-mailgun" rel="nofollow noreferrer">https://www.npmjs.com/package/parse-server-mailgun</a></p>
  
  <p>When running this commande:</p>
  
  <pre><code>...$ node ./src/mailgun-tester
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>...../node_modules/parse-server-mailgun/src/mailgun-tester/index.js:24
      User: class User {
            ^^^^^
  
  SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
      at exports.runInThisContext (vm.js:53:16)
      at Module._compile (module.js:373:25)
      at Object.Module._extensions..js (module.js:416:10)
      at Module.load (module.js:343:32)
      at Function.Module._load (module.js:300:12)
      at Function.Module.runMain (module.js:441:10)
      at startup (node.js:139:18)
      at node.js:968:3
  </code></pre>
  
  <p>Anyone knows what this is about?</p>