Fix editor support test for node 4

[SimenB]

Summary
Node 4 test suite is broken. Why the Circle CI badge is green in the readme is beyond me 😕 Something odd with Circle 2?

/cc @orta

fancy

Test plan
CI for node 4 should be green.

[cpojer]

oh yeah!

[cpojer]

We should probably drop node 4 soon.

[SimenB]

Do a 22 once node 8 hits LTS? It's due later this month

[cpojer]

Sounds like a great plan.

[orta]

👍

[codecov-io]

Codecov Report

Merging #4640 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #4640   +/-   ##
=======================================
  Coverage   57.12%   57.12%           
=======================================
  Files         194      194           
  Lines        6566     6566           
  Branches        3        3           
=======================================
  Hits         3751     3751           
  Misses       2815     2815

Impacted Files	Coverage Δ
packages/jest-editor-support/src/Snapshot.js	98.07% <100%> (ø)	⬆️

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[github-actions]

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