Bump compat to include Functors v0.5

[gnadt]

Summary
Supersedes #562, which is inactive.

Proposed changes
Bump compat to include Functors v0.5.

Breaking changes
Potentially breaks @functor, TBD.

[theogf]

Looks good to me, could you bump the package version?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.28%. Comparing base (78b9141) to head (1a7ca7c).

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #566   +/-   ##
======================================
  Coverage    0.28%   0.28%           
======================================
  Files          52      52           
  Lines        1421    1421           
======================================
  Hits            4       4           
  Misses       1417    1417           

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[gnadt]

Added another change so the docs build with this PR ...before bumping the package version, what's the status of #564? It'd be nice if there weren't a bunch of "failed" checks before merging

[willtebbutt]

I've just reviewed #564 -- I'm happy for it to be merged. Taking a look at #568 now