optimize

NOTICE

     * http://www.apache.org/licenses/LICENSE-2.0 (Apache License 2.0)
   * HOMEPAGE:
     * http://www.slf4j.org
-
-Log4j:
-
-  * LICENSE:
-    * http://www.apache.org/licenses/LICENSE-2.0 (Apache License 2.0)
-  * HOMEPAGE:
-    * http://log4j.apache.org

doc/db/tables_xxl_job.sql

+#
+# XXL-JOB v2.1.0
+# Copyright (c) 2015-present, xuxueli.
+
 CREATE database if NOT EXISTS `xxl_job` default character set utf8 collate utf8_general_ci;
 use `xxl_job`;
 
 
-
 CREATE TABLE `xxl_job_info` (
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `job_group` int(11) NOT NULL COMMENT '执行器主键ID',