fix: Support proper SSL settings using `DATABASE_SSL` (#585)
fix: Support proper SSL settings using `DATABASE_SSL` (#585)

As described in https://node-postgres.com/features/ssl , `ssl` is an object which will be passed to Node TLS socket.
Also:

```
(node:1) DeprecationWarning: Implicit disabling of certificate verification is deprecated and will be removed in pg 8. Specify `rejectUnauthorized: true` to require a valid CA or `rejectUnauthorized: false` to explicitly opt out of MITM protection.
```

This change makes it possible to configure accepted SSL CA certificate, or to accept self-signed certificate.
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