Update CONTRIBUTING.md

[dangell7]

High Level Overview of Change

Update the list of Maintainers and Code Reviewers

Context of Change

Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Refactor (non-breaking change that only restructures code)
• [ ] Performance (increase or change in throughput and/or latency)
• [ ] Tests (you added tests for code that already exists, or your new feature included in this PR)
• [ ] Documentation update
• [ ] Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• [ ] Release

API Impact

• [ ] Public API: New feature (new methods and/or new fields)
• [ ] Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• [ ] libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• [ ] Peer protocol change (must be backward compatible or bump the peer protocol version)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.0%. Comparing base (f4da2e3) to head (d959c84).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #4904   +/-   ##
=======================================
  Coverage     71.0%   71.0%           
=======================================
  Files          796     796           
  Lines        66793   66793           
  Branches     10987   10987           
=======================================
  Hits         47420   47420           
  Misses       19373   19373           

see 3 files with indirect coverage changes