upd(config): Add new option to the .rr.yaml

[rustatian]

Reason for This PR

• Update .rr.yaml

Description of Changes

• Add unavailable_status_code option to the status config section

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing.
• [x] Any required documentation changes (code and docs) are included in this PR.
• [x] Any user-facing changes are mentioned in CHANGELOG.md.
• [x] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #36 (59d4881) into master (7b07600) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #36   +/-   ##
=======================================
  Coverage   52.20%   52.20%           
=======================================
  Files          11       11           
  Lines         295      295           
=======================================
  Hits          154      154           
  Misses        131      131           
  Partials       10       10           

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