data/bitcoin2015to2017_wf.h5 file is not found kindly add this file <img width="1280" alt="screenshot 2018-11-25 at 1 32 01 pm" src="https://user-images.githubusercontent.com/37737135/48976962-a7849c00-f0b6-11e8-9899-11ec1fc3c3df.png">
