Issue when starting sequana duee to pytz

[cokelaer]

We got this error message

ImportError: C extension: No module named 'pytz.tzinfo' not built. If you want to import pandas from the source directory, you may need to run 'python setup.py build_ext --inplace --force' to build the C extensions first.

one possible solution found was to reinstall pytz with pip:

pip uninstall pytz
pip install --pre pytz

as suggested here biocore/deblur#163

[cokelaer]

added note in the faqs