13-raster categories are no longer the existing one from recent download

[stijnvanhoey]

road_types = [
    "Motorway, Freeway, or Other Major Road",
    "a Major Road Less Important than a Motorway",
    "Other Major Road",
]

IN new version of the data set -> "Motorway, Freeway or Other Major Road", "Major Road Less Important than a Motorway", "Other Major Road".

-> need to update the data and code

[stijnvanhoey]

Updated and tackled as part of plovercode/course-python-geospatial#65