add biography to clarkson user object

Author: kevinpoot

src/WordPress_Object/Clarkson_User.php

@@ -159,6 +159,15 @@ public function get_login() {
 		return $this->get_user()->user_login;
 	}
 
+	/**
+	 * Get the user's biography.
+	 *
+	 * @return string Biography.
+	 */
+	public function get_biography() {
+		return $this->get_user()->description;
+	}
+
 	/**
 	 * Get the user's roles.
 	 *