TST: Environment variable in .travis.yml needs to be preceeded by dollar sign
TST: Environment variable in .travis.yml needs to be preceeded by dollar sign

snario/geopandas,urschrei/geopandas,koldunovn/geopandas,micahcochran/geopandas,geopandas/geopandas,jorisvandenbossche/geopandas,ozak/geopandas,fonnesbeck/geopandas,maxalbert/geopandas,micahcochran/geopandas,jdmcbr/geopandas,IamJeffG/geopandas,kwinkunks/geopandas,ozak/geopandas,geopandas/geopandas,perrygeo/geopandas,jorisvandenbossche/geopandas,jorisvandenbossche/geopandas,scw/geopandas,geopandas/geopandas,jdmcbr/geopandas