Add link to Netlify job description (#439)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

readme.md

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 > Process execution for humans
 
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+Netlify is looking for a senior/expert Node.js backend engineer to join a fully remote, international, diverse (44% women and non-binary) and friendly team. This is for the team where one of the co-maintainers [@ehmicky](https://github.com/ehmicky) is working. The job description is [here](https://boards.greenhouse.io/netlify/jobs/4832483002).
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 ## Why
 
 This package improves [`child_process`](https://nodejs.org/api/child_process.html) methods with: