requirements.txt needs chardet added

[markcoletti]

I installed atomai in a conda python 3.11 environment, and I got the following when attempting to import the package:

Python 3.11.5 (main, Sep 11 2023, 13:54:46) [GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import atomai as aoi
Traceback (most recent call last):
  File "/home/may/.conda/envs/intersect/lib/python3.11/site-packages/requests/compat.py", line 11, in <module>
    import chardet
ModuleNotFoundError: No module named 'chardet'

Manually installing chardet package fixed the problem, so hopefully updating requirements.txt will fix the problem.