Update README.md

[LastStranger]

people who use windows will throw an error when they use "NODE_ENV=production webpack", it doesn't work on windows

Notable Changes

✏️ Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue down below.

Commit Message Summary (CHANGELOG)

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Type

ℹ️ What types of changes does your code introduce?

👉 Put an x in the boxes that apply and delete all others

• [ ] CI
• [ ] Fix
• [ ] Perf
• [x] Docs
• [ ] Test
• [ ] Chore
• [ ] Style
• [ ] Build
• [ ] Feature
• [ ] Refactor

SemVer

ℹ️ What changes to the current semver range does your PR introduce?

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• [x] Fix (:label: Patch)
• [ ] Feature (:label: Minor)
• [ ] Breaking Change (:label: Major)

Issues

ℹ️ What issue(s) (if any) are closed by your PR?

👉 Replace #1 with the issue number that applies and remove the `

• Fixes #1

Checklist

ℹ️ You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. This is a reminder of what we are going to look for before merging your code.

👉 Put an x in the boxes that apply and delete all others.

• [ ] Lint and unit tests pass with my changes
• [ ] I have added tests that prove my fix is effective/works
• [x] I have added necessary documentation (if appropriate)
• [ ] Any dependent changes are merged and published in downstream modules

[coveralls]

Coverage remained the same at 97.26% when pulling 8782ff97d0501997c3d6b0cb646827fe605cdb28 on LastStranger:patch-1 into 4349ea939d42d6ac4a4c1d3e3b231d3588431a14 on michael-ciniawsky:master.