Outdated examples

Some of the examples are outdated and don't execute properly with the last versions of PyMEOS.

For example, https://github.com/MobilityDB/PyMEOS-Examples/blob/main/MovingPandas/MovingPandas%20-%20PyMEOS%20-%20Generalization.ipynb has several calls to the `simplify` method which no longer exists.

All the notebooks should be reviewed and updated accordingly.