Compare "relevant" keywords between the advisory text and the commits messages

[sacca97]

Using spacy to extract nouns, propn or verbs from the advisory and the commits messages and then looking for matches seems a good start to treat difficult candidates that do not match any other rule.

This issue supersedes #327, #271 and #259.

[copernico]

I would try extracting verbs too and applying stemming (or lemmatisation).

[sacca97]

Closed by #342