[Snyk] Security upgrade eslint from 3.1.1 to 4.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	748/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.1	Improper Privilege Management SNYK-JS-SHELLJS-2332187	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: eslint

The new version differs by 250 commits.

• c61194f 4.0.0
• 821a1e6 Build: changelog update for 4.0.0
• 4aefb49 Chore: avoid using deprecated rules on ESLint codebase (can't create react app showing error as: facebook/create-react-app#8708)
• 389feba Chore: upgrade deps. (Simplify wording in setting-up-your-editor.md facebook/create-react-app#8684)
• 3da7b5e Fix: Semi-Style only check for comments when tokens exist (fixes Is there a way to use husky when creating a cra template? facebook/create-react-app#8696) (A webpack plugin integration facebook/create-react-app#8697)
• 3cfe9ee Fix: Add space between async and param on fix (fixes Docs for how to use the dev proxying feature with the local network feature, if possible facebook/create-react-app#8682) (React Scripts issues with Babel Loader facebook/create-react-app#8693)
• c702858 Chore: enable no-multiple-empty-lines on ESLint codebase (Use process.execPath to spawn node subprocess facebook/create-react-app#8694)
• 34c4020 Update: Add support for parens on left side for-loops (fixes: Add COMPILE_DEPENDENCIES build setting facebook/create-react-app#8393) (Create react app docs are down for me? facebook/create-react-app#8679)
• 735cd09 Docs: Correct the comment in an example for `no-mixed-requires` (Fix trailing slash for windows os facebook/create-react-app#8686)
• 026f048 Chore: remove dead code from prefer-const (react-scripts build ignores ESLint overrides facebook/create-react-app#8683)
• a8e1c1c 4.0.0-rc.0
• 1768dc0 Build: changelog update for 4.0.0-rc.0
• 0058b0f Update: add --fix to no-debugger (npx create-react-app fails because of core-js update.  facebook/create-react-app#8660)
• b4daa22 Docs: Note to --fix option for strict rule (Build fails: Could not find plugin "proposal-numeric-separator" facebook/create-react-app#8680)
• 4df33e7 Chore: check for root:true in project sooner (fixes Indicate that the file structure is the template's facebook/create-react-app#8561) (Support source maps for scss in dev environments facebook/create-react-app#8638)
• c9b980c Build: Add Node 8 on travis (Progress bar when run npm run build facebook/create-react-app#8669)
• 9524833 Fix: Don't check object destructing in integer property (fixes Custom Jest transformations are applied after default transformations facebook/create-react-app#8654) (How do i remove assert function calls facebook/create-react-app#8657)
• c4ac969 Update: fix parenthesized ternary expression indentation (fixes Add support for Jest option "testMatch" facebook/create-react-app#8637) (Add minimal template facebook/create-react-app#8649)
• 4f2f9fc Build: update license checker to allow LGPL (fixes Issue in create react app facebook/create-react-app#8647) (Support pnpm/don't default to yarn lock facebook/create-react-app#8652)
• b0c83bd Docs: suggest pushing new commits to a PR instead of amending (Create app123 facebook/create-react-app#8632)
• d0e9fd2 Fix: Config merge to correctly account for extends (fixes After npm run eject our app throws an error with react-app-polyfill/stable  facebook/create-react-app#8193) (npm start The react-scripts package provided by Create React App requires a dependency: "babel-eslint": "10.0.3" facebook/create-react-app#8636)
• 705d88f Docs: Update CLA link on Pull Requests page (Yarn Not Starting facebook/create-react-app#8642)
• 794d4d6 Docs: missing paren on readme (Images in CSS are not present in manifest but present as versioned files in the production build facebook/create-react-app#8640)
• 7ebd9d6 New: array-element-newline rule (fixes Fix jest testMatch facebook/create-react-app#6075) (I'm facing issues with CSS after I run build.  facebook/create-react-app#8375)

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