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* implement 129, add pandas DataFrame i/o for convenience by hobu in
https://github.com/PDAL/python/pull/130
* harden getMetadata and related calls from getting non-utf-8 'json' by hobu
in https://github.com/PDAL/python/pull/140
* ignore DataFrame test if not GeoPandas, give up on Python 3.7 builds by hobu
in https://github.com/PDAL/python/pull/137