matplotlib>=2.1.0
numpy>=1.11.0
pandas>=0.20.3
pyBigWig>=0.2.8
scipy>=0.19.1
seaborn>=0.8.1
six>=1.11.0
Click>=6.0
click-help-colors>=0.3
Biopython>=1.70

matplotlib>=2.1.0
numpy>=1.11.0
pandas>=0.20.3
pyBigWig>=0.2.8
scipy>=0.19.1
seaborn>=0.8.1
six>=1.11.0
Click>=6.0
click-help-colors>=0.3
Biopython>=1.70,<1.78

Use BioPython version < 1.78
Use BioPython version < 1.78

[BioPython version 1.78 no longer uses `Bio.Alphabet`](https://github.com/biopython/biopython/blob/master/NEWS.rst#4-september-2020-biopython-178). 
`pyseglogo` uses `Bio.Alphabet` in [expected_frequencies.py](https://github.com/saketkc/pyseqlogo/blob/master/pyseqlogo/expected_frequencies.py).
Therefore, restrict BioPython to versions lower then 1.78.