Does not work with dates in 2017-12-01

@johntitus any thought why this does not work ( it works using with the date mentioned in readme node simulate.js -b 2016-06-01 )

reserved-198-143:~/git/coinsimulator$ node simulate.js -b 2017-12-01

Spent: $0
Value: $0
Profit: $0
Growth: NaN%
reserved-198-143:~/git/coinsimulator$
reserved-198-143:~/git/coinsimulator$
reserved-198-143:~/git/coinsimulator$ node simulate.js -b 2017-11-01

Spent: $0
Value: $0
Profit: $0
Growth: NaN%
reserved-198-143:~/git/coinsimulator$

Hi @ksingh7, I came across this repo a couple of days ago and found the same issue. The problem is that the data in data/snapshots.json it's not updated. I'm looking for a place where I can get this data easily