trying to fix contributing page

[kailuowang]

No description provided.

[codecov-io]

Codecov Report

Merging #1895 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1895   +/-   ##
======================================
  Coverage    95.2%   95.2%           
======================================
  Files         248     248           
  Lines        4379    4379           
  Branches      125     125           
======================================
  Hits         4169    4169           
  Misses        210     210

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[ceedubs]

I'm not too familiar with how this works, but it looks reasonable to me.

[kailuowang]

I will try republish the website shortly (we should be fine, no breaking change so far)