Release 2.2

CHANGES:

Release 2.1

CHANGES:

* Missing SASL authentication impl provides an error instead of hanging (#122).
* pgx_lwt_mirage now requires conduit 2.3 instead of 2.2 (#117).

Add TLS support for Pgx_async (#108)

This adds TLS support for Pgx_async using Conduit.

There are a few things that aren't ideal about this:

- We're using the Conduit.V1 interface, which we may not want to rely on (the latest is V3)
- We haven't implemented this for Lwt yet since they don't expose the same SSL upgrade interface in Conduit

Resolves #107

Add base64 to with-tests

- Pgx_async, Pgx_unix, and Pgx_lwt need base64
- Pgx doesn't actually use base64
- Pgx_lwt doesn't have tests

Distribution 0.1