Update 1.7a3 release date
Changes
=======
-1.7a3 (2019-12-30)
+1.7a3 (2019-12-31)
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Bug fixes:
+- Add /usr/local/lib to the list of directories to be searched for the GEOS
+ shared library (#795).
- ops.substring now returns a line with coords in end-to-front order when given
a start position that is greater than the end position (#628).
- Implement ``__bool__()`` for geometry base classes so that ``bool(geom)``
