For a 1.9.4 release

[ablaom]

Fixes @mlj_model for packages that only import MLJModelInterface instead of using MLJModelInterface.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9736531) 89.26% compared to head (4393ab5) 89.26%.
Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #185   +/-   ##
=======================================
  Coverage   89.26%   89.26%           
=======================================
  Files           8        8           
  Lines         382      382           
=======================================
  Hits          341      341           
  Misses         41       41           

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