minor format in readme
minor format in readme

USGS-Astrogeology/GDAL_scripts,USGS-Astrogeology/GDAL_scripts,thareUSGS/GDAL_scripts,thareUSGS/GDAL_scripts,thareUSGS/GDAL_scripts,thareUSGS/GDAL_scripts,USGS-Astrogeology/GDAL_scripts,USGS-Astrogeology/GDAL_scripts