Only run change-coverage for PRs

[robtaylor]

change-coverage should only run on branches - it fails when on develop branch

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.24%. Comparing base (f5a2de4) to head (2c8ff0d).
Report is 20 commits behind head on develop.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #671   +/-   ##
========================================
  Coverage    96.24%   96.24%           
========================================
  Files           41       41           
  Lines         5220     5220           
  Branches      1226     1226           
========================================
  Hits          5024     5024           
  Misses         124      124           
  Partials        72       72           

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