Add notice about a breaking change

[tomplus]

It closes #338

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.35%. Comparing base (1978af8) to head (deda6b1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #341   +/-   ##
=======================================
  Coverage   27.35%   27.35%           
=======================================
  Files         795      795           
  Lines       96326    96326           
=======================================
  Hits        26347    26347           
  Misses      69979    69979           

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