* Streaming replication protocol support (epgsql may act like PostgreSQL slave)
https://github.com/epgsql/epgsql/blob/devel/streaming.md
* Connection options now may be passed as map()
* More error extra data fields returned in #error{extra}
http://www.postgresql.org/docs/current/interactive/protocol-error-fields.html
* Prefer non-localized severity in #error{severity} when available
* Added `set_notice_receiver/2` function to dynamically change receiver for asynchronous notifications
* Asynchronous notifications receiver may be set to registered process name (atom)
* `get_cmd_status/1` function added
* Fixed return value of `DELETE ... RETURNING ..` in case when 0 rows were deleted
(now returns `{ok, 0, Columns, []}` instead of `{ok, 0}`)
* TCP socket implicitly closed when epgsql connection process terminates
* Some typespecs fixed
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