SECURITY updates

[pboling]

• Add SECURITY.md policy
• Require MFA to publish to RubyGems.org
• Add Maintainer contact email

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.05%. Comparing base (a321202) to head (dcfb14d).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #130   +/-   ##
=======================================
  Coverage   92.05%   92.05%           
=======================================
  Files          15       15           
  Lines         390      390           
  Branches       82       82           
=======================================
  Hits          359      359           
  Misses         31       31           

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[coveralls]

Pull Request Test Coverage Report for Build 11898380097

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.022%

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Totals
Change from base Build 11897555318:	0.0%
Covered Lines:	345
Relevant Lines:	375

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💛 - Coveralls