Made search argument optional, added useronly warning and fixed endpoint (#1407)

src/structures/interfaces/TextBasedChannel.js

@@ -218,6 +218,7 @@ class TextBasedChannel {
 
   /**
    * Performs a search within the channel.
+   * <warn>This is only available when using a user account.</warn>
    * @param {MessageSearchOptions} [options={}] Options to pass to the search
    * @returns {Promise<Array<Message[]>>}
    * An array containing arrays of messages. Each inner array is a search context cluster.
@@ -231,7 +232,7 @@ class TextBasedChannel {
    *   console.log(`I found: **${hit}**, total results: ${res.totalResults}`);
    * }).catch(console.error);
    */
-  search(options) {
+  search(options = {}) {
     return this.client.rest.methods.search(this, options);
   }