models/init.py stays empty, CI didn't update it (causing import problems vs. documentation)

[me9hanics]

The init.py file inside the skmob/models/ folder (and probably many other init.py files in other folders) stays empty after installing with pip.

As I understand it, based on this change the file is now empty by default and is supposed to be automatically modified with CI. However, after my installation, this never happened.
This causes problems with importing the Gravity model based on documentation, from skmob.models import Gravity doesn't work. (I hotfixed it with from skmob.models.gravity import Gravity.)

The Python environment I freshly created for using scikit-mobility uses version 3.9.1 Python. The environment was created in pyenv-win, and the package was installed with pip install scikit-mobility, installing the latest 1.3.1 version.