Changes
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2.3.5
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* Fix memory leak https://github.com/PDAL/python/pull/74
* Handle metadata with invalid unicode by erroring https://github.com/PDAL/python/pull/74

2.3.0
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* PDAL Python support 2.3.0 requires PDAL 2.1+. Older PDAL base libraries
  likely will not work.

* Python support built using scikit-build

* readers.numpy and filters.python are installed along with the extension.

* Pipeline can take in a list of arrays that are passed to readers.numpy

* readers.numpy now supports functions that return arrays. See
  https://pdal.io/stages/readers.numpy.html for more detail.

2.0.0
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* PDAL Python extension is now in its own repository on its own release
  schedule at https://github.com/PDAL/python

* Extension now builds and works under PDAL OSGeo4W64 on Windows.


