Update decorator lower bound, fixes pmorissette/bt/issues/298

[timkpaine]

https://github.com/micheles/decorator/blob/master/CHANGES.md#507-2021-04-14

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c0d5dff) 57.15% compared to head (b9f1b33) 57.15%.
Report is 2 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #216   +/-   ##
=======================================
  Coverage   57.15%   57.15%           
=======================================
  Files           4        4           
  Lines        1160     1160           
  Branches      249      249           
=======================================
  Hits          663      663           
  Misses        433      433           
  Partials       64       64           

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