Consider using yaml.load instead of yaml.safe_load

[raymondlanger]

When I run demo.py the results is:

./demo.py
Start reading data file...
Traceback (most recent call last):
  File "./demo.py", line 473, in <module>
    settings=yaml.load(open("settings.yml","r"))
TypeError: load() missing 1 required positional argument: 'Loader'

The same error occurs when running test_mol.py. I have installed PyYAML version 6.0.1, and using yaml.safe_load() instead of yaml.load() fixes the error. The issue is related to issue #5.