added User#fetchProfile (#835)

* add User#fetchProfile

* fix merge conflicts?

src/structures/User.js

@@ -167,6 +167,14 @@ class User {
     return this.client.rest.methods.unblockUser(this);
   }
 
+  /**
+   * Get the profile of the user
+   * @returns {Promise<UserProfile>}
+   */
+  fetchProfile() {
+    return this.client.rest.methods.fetchUserProfile(this);
+  }
+
   /**
    * Checks if the user is equal to another. It compares username, ID, discriminator, status and the game being played.
    * It is recommended to compare equality by using `user.id === user2.id` unless you want to compare all properties.