Not compatible with Node.js 4 anymore due to Array.prototype.includes

[DanielRuf]

🐛 Bug Report

cefc342 broke Node.js 4 support as Array.prototype.includes is only in Node.js 6.5+ available.

To Reproduce

Use nodenv or nvm, switch to Node 4 and create a project with jest.

Steps to reproduce the behavior:

Expected behavior

Node.js should be supported.

Link to repl or repo (highly encouraged)

See https://travis-ci.org/docker/kitematic/builds/443616745

Issues without a reproduction link are likely to stall.

Run npx envinfo --preset jest

Paste the results here:

[SimenB]

We dropped node 4 with Jest 22 back in December of last year https://jestjs.io/blog/2017/12/18/jest-22#good-bye-node-4-welcome-jsdom-11. The fact the code has worked on older nodes up until now is a coincidence

[DanielRuf]

Well but then it should have been set in the engines field to make this clear or increase the major version as kitematic builds worked before this change as it seems.

[SimenB]

PR welcome! 🙂

[github-actions]

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