Fix for box2d-py Installation Error When Installing momaland on Colab in the example notebook

[jselvaraaj]

using just pip install momaland doesn't work in the colab anymore.

it give this error

Building wheels for collected packages: box2d-py
  error: subprocess-exited-with-error
  
  × python setup.py bdist_wheel did not run successfully.
  │ exit code: 1
  ╰─> See above for output.
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  Building wheel for box2d-py (setup.py) ... error
  ERROR: Failed building wheel for box2d-py
  Running setup.py clean for box2d-py
Failed to build box2d-py
ERROR: ERROR: Failed to build installable wheels for some pyproject.toml based projects (box2d-py)

the fix is to run this before installing momaland.
!apt-get -qq update && apt-get install -y swig