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:

• dissimilar

• similar

• treediff

• diffus

See advisory page for additional details.

[PsiACE]

upstream, wait

• Bump out-of-date deps asomers/mockall#317
  • Minver fix mikedilger/float-cmp#29
  • chore: bump float-cmp to 0.9.0 assert-rs/predicates-rs#109

[PsiACE]

asomers/mockall#325

done, but need to wait for a new version of mockall to be released

[dantengsky]

@PsiACE AFAIK, there is only one test mod user_mgr_test depends on crate mock_all, if we are considering to deprecate this crate(mock_all), please let me know, I'd like to re-write the unit tests

[PsiACE]

if we are considering to deprecate this crate(mock_all), please let me know, I'd like to re-write the unit tests

@dantengsky It would be better if mockall can be easily removed.