change con.end() to con.release() for pooled mysql connections

[snej51]

There are changes made to the actual mysql driver when using pooled connections:

mysqljs/mysql#537

Perhaps it is necessary to change con.end() to con.release() because of this warning:

Calling conn.end() to release a pooled connection is deprecated. In next version calling conn.end() will be restored to default conn.end() behavior. Use conn.release() instead.

thx Jens

[dresende]

Thank you for reminding this. It's not released just yet, but I'm making a change to check if release is defined and use it instead. Otherwise it will continue to call end.

[snej51]

Thank you!

[dresende]

mysql@2.0.0-alpha9 seems to have the con.release but I'll keep the code for a while so people can update orm without having to update mysql.