ModuleNotFoundError: No module named 'smallworld' when running from source

[devos50]

When running the framework from source and following the instructions in the README.md file, I'm getting the following error:

mdevos@IC-ITs-MacBook-Pro-2 decentralizepy % python generate_graph.py --help
Traceback (most recent call last):
  File "/Users/mdevos/Documents/decentralizepy/generate_graph.py", line 1, in <module>
    from decentralizepy.graphs.Regular import Regular
  File "/Users/mdevos/Documents/decentralizepy/src/decentralizepy/graphs/__init__.py", line 2, in <module>
    from .SmallWorld import SmallWorld
  File "/Users/mdevos/Documents/decentralizepy/src/decentralizepy/graphs/SmallWorld.py", line 1, in <module>
    import smallworld
ModuleNotFoundError: No module named 'smallworld'

It seems like smallworld should be added to requirements.txt.

[devos50]

It looks like this requirement will be installed when running setup.py. Still, I think it's a good idea to fill requirements.txt with the required dependencies.