Copy the attribution style from K8S and MLflow

[HiromuHota]

Description of the problems or issues

Is your pull request related to a problem? Please describe.

I'd like to change the way how contributions are attributed. Attributions are important but changes themselves are more important for users.

Does your pull request fix any issue.

N/A

Description of the proposed changes

Push back the attributions.

Test plan

N/A

Checklist

• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.
• [ ] I have updated the CHANGELOG.md accordingly.

[codecov-io]

Codecov Report

Merging #91 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #91   +/-   ##
=======================================
  Coverage   66.02%   66.02%           
=======================================
  Files          22       22           
  Lines        2540     2540           
=======================================
  Hits         1677     1677           
  Misses        863      863           

Flag	Coverage Δ
#unittests	66.02% <ø> (ø)

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