Add reporting_operations to list of model traits

[ablaom]

Requires:

• Add reporting_operations trait StatisticalTraits.jl#25

In support of proposal at MLJBase cross-referenced below.

To do:

• Bump compat for StatisticalTraits

[codecov-commenter]

Codecov Report

Merging #158 (d1752a4) into dev (1628202) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #158   +/-   ##
=======================================
  Coverage   88.75%   88.75%           
=======================================
  Files           8        8           
  Lines         329      329           
=======================================
  Hits          292      292           
  Misses         37       37           

Impacted Files	Coverage Δ
src/MLJModelInterface.jl	100.00% <ø> (ø)

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