expose termination criterion

[koide3]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 91.61%. Comparing base (8122528) to head (4fda016).
Report is 2 commits behind head on master.

Files	Patch %	Lines
...rc/small_gicp/registration/registration_helper.cpp	0.00%	8 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
- Coverage   92.30%   91.61%   -0.69%     
==========================================
  Files          34       34              
  Lines        1065     1073       +8     
  Branches      159      159              
==========================================
  Hits          983      983              
- Misses         82       90       +8     

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