Fix wrong function call in README #118
                
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I changed the get_url code snipper from date = apod_object_parser.get_hdurl(response) to date = apod_object_parser.get_url(response) since I think it's a copy and paste mistake
I also changed the get_media_type code snippet from apod_object_parser.get_hdurl(response) to date = apod_object_parser.get_media_type(response) since I think it's a copy and paste mistake