feat: Add return type to Initiator.certify()

[fmarek-kindred]

No description provided.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (86e1454) 57.10% compared to head (cb5a577) 57.08%.
Report is 1 commits behind head on master.

❗ Current head cb5a577 differs from pull request most recent head d9be981. Consider uploading reports for the commit d9be981 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
- Coverage   57.10%   57.08%   -0.02%     
==========================================
  Files         115      115              
  Lines        5670     5663       -7     
==========================================
- Hits         3238     3233       -5     
+ Misses       2432     2430       -2     

see 5 files with indirect coverage changes

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