chore: document that threshold should stay the same during refresh

[gilcu3]

Closes #57

• After reading carefully the auditor's advice, and the original fix for a similar problem in frost, I think the only thing we can do here is adding a comment for future developers, as the current implementation already guarantees the invariant.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.93%. Comparing base (1e03b9c) to head (a5fb55a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #223   +/-   ##
=======================================
  Coverage   87.92%   87.93%           
=======================================
  Files          41       41           
  Lines        9046     9048    +2     
  Branches     9046     9048    +2     
=======================================
+ Hits         7954     7956    +2     
  Misses        645      645           
  Partials      447      447           

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[netrome]

Thanks!

[SimonRastikian]

This is good. Although I was thinking more of also adding this to the readme

[gilcu3]

This is good. Although I was thinking more of also adding this to the readme

That would be a bit strange, as the function cannot be called with two thresholds anyway :)