'list index out of range' in fast_async_scaper example

[DennisCraandijk]

Describe the bug
When running the fast_async_scraper example I get the following error message
File "/home/--/miniconda3/envs/trender/lib/python3.6/site-packages/pymarketcap-4.0.17-py3.6-linux-x86_64.egg/pymarketcap/pymasyncore.py", line 324, in every_historical File "pymarketcap/processer.pyx", line 158, in pymarketcap.processer.historical File "pymarketcap/processer.pyx", line 187, in pymarketcap.processer.historical IndexError: list index out of range

To Reproduce

1. Clone pymarketcap from git
2. Run fast_async_scraper example