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**Important** This version makes GDAL an optional install. You must ensure you add GDAL to your requirements file, or install wazimap using ``wazimap[gdal]]``. See http://wazimap.readthedocs.io/en/latest/deploying.html
* Make GDAL and Shapely optional. This makes it much easier to get up and running with Wazimap without getting GDAL installed, which can be tricky.
* Support GDAL 1.x or 2.x (2.x not fully tested).