Incorrect expasy rule

[Karl-Krauth]

This rule for thermolysin is incorrect:

pyteomics/pyteomics/parser.py

Line 844 in 66dcd9d

'thermolysin': r'[^DE](?=[AFILMV])',

it should be: r'[^DE](?=[AFILMV][^P])'
If you check the summary of the cleavage rules here: https://web.expasy.org/peptide_cutter/peptidecutter_enzymes.html the [^P] condition isn't included but it's included in the text above it and also seems to be implemented in their perl script.

I haven't checked other enzymes but there might be similar errors there too.

[levitsky]

Thank you for reporting. I made the change you proposed, seeing as the Proline effect is both mentioned in text and implemented in the tool itself.