Update lib/pq version

Merge pull request #12 from tristanfisher/v2_dep_update

update lib/pq

Add TLS/SSL cert mode in DSN

This release includes an improvement from @polera to add TLS support to connection string generation.

Correct mismatch between time.duration and seconds

Merge pull request #3 from tristanfisher/connect_timeout_fix

specify connect seconds, remove unused struct field. v2.

Export utility functions

This release exports utility functions, helpful for creating DSNs and database connections. This is helpful in partial usage of Ivory.