fix(HTTPOptions): change default value in jsdoc to 8 (discordjs#5547)

Author: Yoshida Tomio

src/util/Constants.js

@@ -75,7 +75,7 @@ exports.DefaultOptions = {
   /**
    * HTTP options
    * @typedef {Object} HTTPOptions
-   * @property {number} [version=7] API version to use
+   * @property {number} [version=8] API version to use
    * @property {string} [api='https://discord.com/api'] Base url of the API
    * @property {string} [cdn='https://cdn.discordapp.com'] Base url of the CDN
    * @property {string} [invite='https://discord.gg'] Base url of invites