Looking at CSSEGISandData/COVID-19 and it looks like date-named csv files. It would be helpful if the json returned from the heroku app included the date of the file used to create the json. Right now its unattributed and if someone caches this data, its hard to say if its up to date or not. thanks!

Also, I'm using your api to feed an irc chat bot that announces when the case count increases for our area. This is a great service thanks much!