notebook: glm-model-selection, bambi import error

Notebook title: GLM Model Selection
Notebook url: https://github.com/pymc-devs/pymc-examples/blob/main/examples/generalized_linear_models/GLM-model-selection.ipynb
Note: it is using pymc3

Issue description

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
Input In [1], in <cell line: 2>()
      1 import arviz as az
----> 2 import bambi as bmb
      3 import matplotlib.pyplot as plt
      4 import numpy as np

ModuleNotFoundError: No module named 'bambi'

Expected output

The notebook should run without error.

Proposed solution

Do the requirements file need to be updated to install bambi?

1. https://github.com/pymc-devs/pymc-examples/blob/main/requirements-write.txt
2. https://github.com/pymc-devs/pymc-examples/blob/main/requirements-docs.txt

Open examples/generalized_linear_models/GLM-model-selection.ipynb and run its imports to reproduce the missing bambi error. Then inspect requirements-write.txt and requirements-docs.txt to determine where the dependency belongs. Done means the notebook's bambi import and subsequent execution complete without the reported error.