* Added test and test data for geo.raster.conversion.raster2polygon().
* Replaced skimage downsampling by GDAL variant.
* Removed scikit-image dependency.
* Dropped Python 2.7 support due to end-of-life status.
* Dropped compatibility module since this was Python 2.7 specific.
* Dropped requirements six and packaging.
* Added some docs/.rst files to .gitignore.
* Updated minimal version of pyproj to 2.5.0.
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