Add snowflake utils (#1064)

* snowflakes

* use proper binary for snowflake example

* fix jsdoc errors

* remove dupe

src/structures/VoiceChannel.js

@@ -11,7 +11,7 @@ class VoiceChannel extends GuildChannel {
 
     /**
      * The members in this voice channel.
-     * @type {Collection<string, GuildMember>}
+     * @type {Collection<Snowflake, GuildMember>}
      */
     this.members = new Collection();