update version

Author: gdbtek

cookbooks/mysql/attributes/default.bash

@@ -1,6 +1,6 @@
 #!/bin/bash -e
 
-export MYSQL_DOWNLOAD_URL='http://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.11-linux-glibc2.5-x86_64.tar.gz'
+export MYSQL_DOWNLOAD_URL='http://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.12-linux-glibc2.5-x86_64.tar.gz'
 
 export MYSQL_INSTALL_FOLDER='/opt/mysql'