Merge pull request lib#926 from lib/ping-empty

allow ping during a failed txn

Merge pull request lib#883 from lib/update

bump supported versions; fix tests

Merge pull request lib#857 from jordanlewis/float32

encode: use 64-bit parsing for float32s

Add SCRAM-SHA-256 authentication to this library (lib#833)

Add SCRAM-SHA-256 authentication to this library

Merge pull request lib#778 from lib/go-mod

add a go.mod file in preparation for a tagged release