Add Airbnb logo to list of companies using Jest

[lencioni]

More info:

https://medium.com/airbnb-engineering/unlocking-test-performance-migrating-from-mocha-to-jest-2796c508ec50

Summary

Airbnb is now using Jest, and it seems like a nice idea to include the Airbnb logo in the list of companies using Jest.

Test plan

I did not test this change in any way.

[cpojer]

I did not test it either. We'll see if it works #yolo.

Thanks Joe!

[codecov-io]

Codecov Report

Merging #3835 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3835   +/-   ##
=======================================
  Coverage   57.63%   57.63%           
=======================================
  Files         194      194           
  Lines        6782     6782           
  Branches        6        6           
=======================================
  Hits         3909     3909           
  Misses       2870     2870           
  Partials        3        3

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[cpojer]

It worked! http://facebook.github.io/jest/users.html

[github-actions]

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