v2.1.0

Release 2.1.0

* Added public readonly array pq\Result::$diag property, listing PQresultErrorField details (gh-issue #14)
* Restore listeners and prepared statements after a connection reset (gh-issue #15)
* Added pq\Connection::$nonblocking and pq\Connection::flush() to support non-blocking writes (gh-issue #16)
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