Add Emmanuel as a contributor

[MichaelChirico]

cc @emmanuel-ferdman I've invited you to be a maintainer on {lintr}. Thanks for your contributions!

Please (1) help adjust this PR if you'd like any changes to your citation in DESCRIPTION (2) hereafter create branches directly on this repo instead of your fork, it will make collaboration slightly easier.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.23%. Comparing base (bbbbd2e) to head (d2c3b62).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3016   +/-   ##
=======================================
  Coverage   99.23%   99.23%           
=======================================
  Files         128      128           
  Lines        7293     7293           
=======================================
  Hits         7237     7237           
  Misses         56       56           

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[emmanuel-ferdman]

Thanks Michael, appreciate the invite! The DESCRIPTION entry looks good as-is. Will use branches on the main repo going forward :)