Update Node version support in README and docs

[satya164]

Fixes #4947

[codecov-io]

Codecov Report

Merging #5622 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #5622   +/-   ##
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  Coverage    60.9%   60.9%           
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  Files         215     215           
  Lines        7325    7325           
  Branches        3       3           
======================================
  Hits         4461    4461           
  Misses       2863    2863           
  Partials        1       1

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[thymikee]

Cool! Can you also remove parts about explicitly installing babel-jest? I think we could also remove the references to regenerator-runtime because it's a transitive dependency from babel-runtime that we use

[cpojer]

Can you also update https://github.com/facebook/jest/blob/master/docs/GettingStarted.md ? Thanks!

[github-actions]

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