feat: mute/unmute chats (#168)

Co-authored-by: Pedro S. Lopez <pedroslopez@me.com>

src/structures/Chat.js

@@ -112,6 +112,23 @@ class Chat extends Base {
         return this.client.unarchiveChat(this.id._serialized);
     }
 
+    /**
+     * Mutes this chat until a specified date
+     * @param {Date} unmuteDate Date at which the Chat will be unmuted
+     * @returns {Promise<Boolean>} new mute state
+     */
+    async mute(unmuteDate) {
+        return this.client.muteChat(this.id._serialized, unmuteDate);
+    }
+    
+    /**
+     * Unmutes this chat
+     * @returns {Promise<Boolean>} new mute state
+     */
+    async unmute() {
+        return this.client.unmuteChat(this.id._serialized);
+    }
+
     /**
      * Loads chat messages, sorted from earliest to latest.
      * @param {Object} searchOptions Options for searching messages. Right now only limit is supported.