Support real upserts on PostgreSQL 9.5

[ottob]

http://www.depesz.com/2015/05/10/waiting-for-9-5-add-support-for-insert-on-conflict-do-nothingupdate/

That would be really nice to have.

[mgutz]

I intend to add this. I'll look in more detail when 9.5 goes beta.

[darh]

Any updates about this?

[ottob]

I wrote down some thoughts here: go-ozzo/ozzo-dbx#5

It would be nice to hear what others think about this.