Changes
=======

* Add geometry, geography, box2d, and box3d PostGIS types (#518)
  (by @vpetrovykh in 65d5cdc9)

* Add a rudimentary warning system (#523)
  (by @msullivan in 29370f2b)

Fixes
=====

* use StopIteration.value in blocking client _iter_coroutine (#508)
  (by @graingert in d0e9ed18)