text: Title: delay_after_gen warning
  Body: Hello,
  I am using PyGAD version: 3.3.1 on Windows with python 3.10 within jupyter notebook.
  
  When I run my GA, I am getting the following user warning. This is not something I am setting. It seems to emanate from the internal pygad code. How can I avoid having this warning displayed? Thank you
  
  ```
  C:\Users\wassimj\AppData\Local\Programs\Python\Python310\lib\site-packages\pygad\pygad.py:1139: UserWarning:
  
  The 'delay_after_gen' parameter is deprecated starting from PyGAD 3.3.0. To delay or pause the evolution after each generation, assign a callback function/method to the 'on_generation' parameter to adds some time delay.
  ```