add voice region getting (#1108)

* add voice region getting

* clean up this mess

* add docstrings

* Update VoiceRegion.js

* Update RESTMethods.js

src/structures/Guild.js

@@ -322,6 +322,14 @@ class Guild {
     return this.client.rest.methods.getGuildWebhooks(this);
   }
 
+  /**
+   * Fetch available voice regions
+   * @returns {Collection<string, VoiceRegion>}
+   */
+  fetchVoiceRegions() {
+    return this.client.rest.methods.fetchVoiceRegions(this.id);
+  }
+
   /**
    * Fetch a single guild member from a user.
    * @param {UserResolvable} user The user to fetch the member for

src/structures/VoiceRegion.js

@@ -0,0 +1,50 @@
+/**
+ * Represents a Discord voice region for guilds
+ */
+class VoiceRegion {
+  constructor(data) {
+    /**
+     * ID of the region
+     * @type {string}
+     */
+    this.id = data.id;
+
+    /**
+     * Name of the region
+     * @type {string}
+     */
+    this.name = data.name;
+
+    /**
+     * Whether the region is VIP-only
+     * @type {boolean}
+     */
+    this.vip = data.vip;
+
+    /**
+     * Whether the region is deprecated
+     * @type {boolean}
+     */
+    this.deprecated = data.deprecated;
+
+    /**
+     * Whether the region is optimal
+     * @type {boolean}
+     */
+    this.optimal = data.optimal;
+
+    /**
+     * Whether the region is custom
+     * @type {boolean}
+     */
+    this.custom = data.custom;
+
+    /**
+     * A sample hostname for what a connection might look like
+     * @type {string}
+     */
+    this.sampleHostname = data.sample_hostname;
+  }
+}
+
+module.exports = VoiceRegion;