Clarify that this is not pg

[mmkal]

pg is the de-facto Postgres client for nodejs and is sometimes referred to as "node-postgres".

I imagine most people installing this are really looking for pg - it'd be good to clarify this for anyone looking at the docs.

Or, if this is unmaintained (no updates in 4 years) maybe it's worth deprecating on npm too.

[fuxingZhang]

You are right.

Can you submit a pull request, I will merge it.

Thanks for your help.