CompatHelper: bump compat for Flux to 0.16, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Flux package from 0.15.2 to 0.15.2, 0.16.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[bclyons12]

Any update on supporting Flux v0.16?

[DrChainsaw]

Thanks for the reminder.

I got a little bit burnt by adding support for 0.15 too early so I wanted to wait a little bit and then it slipped my mind. I'll try to find some time for it in the neartime.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.94%. Comparing base (a7e3285) to head (04afeb9).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #100   +/-   ##
=======================================
  Coverage   92.94%   92.94%           
=======================================
  Files          16       16           
  Lines        1319     1319           
=======================================
  Hits         1226     1226           
  Misses         93       93           

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