Update CONTRIBUTING.md with new Owners

[techknowlogick]

As title

[codecov-io]

Codecov Report

Merging #3281 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3281      +/-   ##
==========================================
+ Coverage   34.81%   34.82%   +<.01%     
==========================================
  Files         277      277              
  Lines       40263    40263              
==========================================
+ Hits        14018    14021       +3     
+ Misses      24184    24183       -1     
+ Partials     2061     2059       -2

Impacted Files	Coverage Δ
models/repo_list.go	65.62% <0%> (-1.57%)	⬇️
models/repo.go	43.38% <0%> (+0.18%)	⬆️
models/repo_indexer.go	51.94% <0%> (+0.97%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7944ff7...d610d6a. Read the comment docs.

[ethantkoenig]

LGTM