Update README.md

README.md

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 All of the images from [hirise-map-proj-v3_2](https://zenodo.org/records/4002935) transformed to csv input so as to make it easier to feed into neural networks.
 
 ### About the data
-Types of images (image labels): {0: "other", 1: "crater", 2: "dark dune", 3: "slope streak", 4: "bright dune", 5: "impact ejecta", 6: "swiss cheese", 7: "spider"}
+Types of images (image labels): `{0: "other", 1: "crater", 2: "dark dune", 3: "slope streak", 4: "bright dune", 5: "impact ejecta", 6: "swiss cheese", 7: "spider"}`
 
 ### Citation
 * Original dataset source: https://data.nasa.gov/Space-Science/Mars-orbital-image-HiRISE-labeled-data-set-version/egmv-36wq/about_data