Bug handling NUMERIC in underlying postgresql driver

[alexvetter]

We have a problem regarding the handling of NUMERIC columns. It's a bug in the underlying postgresql driver. @Narigo already did some research (mauricio/postgresql-async#164) and based on that the bug was fixed.

When using NUMERIC columns, updating them with an integer value at first and updating it with a floating number later, an exception is thrown.

The fix is included in the current release of the driver (0.2.19). @Narigo also did an PR for upgrading the postgresql driver (#45).

It would be great to have an bugfix release of the mysql-postgresql-client.

[jan-zajic]

please someone close this issue as fixed with #45, which is merged