update official MySQL JDBC driver to 5.1.30

Author: kares

jdbc-mysql/lib/jdbc/mysql/version.rb

@@ -1,6 +1,6 @@
 module Jdbc
   module MySQL
-    DRIVER_VERSION = '5.1.28'
+    DRIVER_VERSION = '5.1.30'
     VERSION = DRIVER_VERSION
   end
 end