Backports (#1813)

* Backported OAuth2Application 201ecd25a2

* Backported retry on 500 57b6980313

* Backported b8034525e3 and fa5c4efa2b

src/structures/User.js

@@ -12,7 +12,7 @@ class User {
     /**
      * The client that created the instance of the user
      * @name User#client
-     * @type {}
+     * @type {Client}
      * @readonly
      */
     Object.defineProperty(this, 'client', { value: client });