RUSTSEC-2020-0095: difference is unmaintained

[github-actions]

difference is unmaintained

Details
Status	unmaintained
Package	difference
Version	2.0.0
URL	johannhof/difference.rs#45
Date	2020-12-20

The author of the difference crate is unresponsive.

Maintained alternatives:

• pretty_assertions

• dissimilar

• treediff

• diffus

See advisory page for additional details.

[rlespinasse]

Current dependency path between wints and difference

difference <= predicates <= wints

Since this crate is not directly use by wints and the advisory is only because of a unmaintained situation, no action will be taken for now.

Feel free to reopen this issue if the situation evolve.