Add warning to contributing docs

[evroon]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.94%. Comparing base (ca07c6c) to head (548de25).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1417   +/-   ##
=======================================
  Coverage   94.94%   94.94%           
=======================================
  Files         118      118           
  Lines        4335     4335           
=======================================
  Hits         4116     4116           
  Misses        219      219           

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