Pillow should be required at the install

[GLambard]

Issue:

>>> import scipdf
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/guillaume/miniconda3/envs/grobid_python/lib/python3.9/site-packages/scipdf/__init__.py", line 6, in <module>
    from scipdf.pdf.parse_pdf import *
  File "/home/guillaume/miniconda3/envs/grobid_python/lib/python3.9/site-packages/scipdf/pdf/__init__.py", line 1, in <module>
    from .parse_pdf import *
  File "/home/guillaume/miniconda3/envs/grobid_python/lib/python3.9/site-packages/scipdf/pdf/parse_pdf.py", line 10, in <module>
    from PIL import Image
ModuleNotFoundError: No module named 'PIL'

Solution:

pip install Pillow

Cheers!