[Snyk] Security upgrade snyk-config from 2.1.0 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
	758/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.3	Prototype Pollution SNYK-JS-Y18N-1021887	Yes	Proof of Concept

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

Commit messages

Package name: snyk-config

The new version differs by 41 commits.

• 34bd34e Merge pull request #43 from snyk/fix/bundle-nconf
• b9cc6b6 feat: swap yargs parser with minimist
• 2b3935c feat: re-enable argv parsing with yargs
• 3b8a4e1 feat: add the original argv module
• 392e6f2 fix: use vendored nconf
• b90e7e7 fix: vendor nconf to remove vulnerable yargs version
• f2c0e1e chore: add the original nconf library
• eb0f55f Merge pull request #42 from snyk/test/add-more-test-cases
• bf4231e test: add more tests for argument parsing
• c10881d test: add test case for value type changing
• f167704 Merge pull request chore: 'npm run build' in appveyor snyk/cli#40 from snyk/fix/less-lodash
• d671a6e fix: Reduce lodash, use lodash.merge directly
• 136b3a9 Merge pull request #39 from snyk/feat/use-patched-lodash
• a2d2453 feat: use forked lodash patched against zipObjectDeep vulnerability
• b4b4912 Merge pull request #38 from snyk/fix/major-release
• 5c3aaef fix: trigger a major release
• af60412 Merge pull request #37 from snyk/feat/service-env
• d177015 docs: package name is wrong
• 1037183 BREAKING CHANGE: load SERVICE_ENV instead of local by default
• 5e90504 chore: disable lots of eslint warnings
• 9cac115 feat: eslint --fix
• e670f86 BREAKING CHANGE: drop node 6 support
• 39eba76 chore: remove unused npm run semantic-release, travis runs it
• 6e60b3b feat: basic types

See the full diff

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