fix(postgres): Use postgres::Connection instead of postgres::PostgresConnection
fix(postgres): Use postgres::Connection instead of postgres::PostgresConnection

photex/nickel-postgres,filsmick/nickel-postgres,nickel-org/nickel-postgres,matthewbentley/nickel-redis,starim/nickel-postgres,tempbottle/nickel-postgres,TileHalo/nickel-postgres,Ryman/nickel-postgres