TST: test with latest 0.18.x pandas release (#349)
TST: test with latest 0.18.x pandas release (#349)


jorisvandenbossche/geopandas,jorisvandenbossche/geopandas,ozak/geopandas,micahcochran/geopandas,jorisvandenbossche/geopandas,geopandas/geopandas,ozak/geopandas,geopandas/geopandas,jdmcbr/geopandas,jdmcbr/geopandas,micahcochran/geopandas,geopandas/geopandas