Pool connection with postgres #825

Hello,

I tried node-orm2 for the first time today. I think there is an issue on pool connection with pg driver from v7.0.

With newer version I have "TypeError: this.db.connect is not a function" error when trying to connect using pool connection. No error with "query: {pool: false}" option.

I downgraded pg driver version to 6.4.1 and it fixed the issue. But there is warning at connect: "DeprecationWarning: PG.connect is deprecated - please see the upgrade guide at https://node-postgres.com/guides/upgrading". The link explain how to resolve the connect issue.

I'll continue to discover your tools.