Mysql 8 Support
This release includes a very small change so that the Transaction handling in Doctrine works with Mysql 8.0+
Doctrine will sometimes make a query to get the transaction isolation global variable from the server, previous to this change, the variable it was trying to access doesn't exist in Mysql 8.0 (deprecated in 5.7.20, and removed in 8.0).
Doctrine will now detect the mysql version and issue the correct query for this variable depending on the version of the server.