Anthony Dodd 82923a1aaa Update stream impls.
The basic PgListener stream impl now yields `Result<PgNotification>`
elements without an `Option` in the result. The option condition
originally represented the closure of the underlying connection. Now
such conditions will terminate the stream, as one would expect. The
`PgListener.recv()` method signature has not been changed.

PgPoolListener has also been updated. The interfaces on this struct will
never yield an inner `Option` as it will instead acquire a new
connection and continue its work. Both the stream impl & the `recv`
method have received an update to their signatures.
2020-03-15 02:17:14 -07:00
..
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