[Snyk] Security upgrade front-matter from 2.1.2 to 4.0.1

[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
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Arbitrary Code Execution SNYK-JS-FRONTMATTER-569103	Yes	Proof of Concept

Commit messages

Package name: front-matter

The new version differs by 50 commits.

• 90d23d1 4.0.1
• f71652c Fix case of `allowUnsafe` in boolean coercion
• 80ff5d4 Merge branch 'tyankatsu0105-test/add-declaration-test'
• 2d1bd3f feat: add options args to fm
• 854bab6 chore: remove unused file
• f4d091f test: add typescript description test
• 0ec3a2c 4.0.0
• 5e574da Merge branch 'peterbe-65-yamlsafeload'
• 188b598 Merge branch '65-yamlsafeload' of git://github.com/peterbe/front-matter into peterbe-65-yamlsafeload
• 331fff5 update .travis.yml
• 9658b13 feedbacked
• b87b7d9 and readme
• 7887a05 feedbacked
• 60b3b67 readme update
• 1d9094f yaml.safeLoad()
• eaf33a5 3.2.1
• 7c4156c Merge branch 'mourner-patch-1'
• 0058684 smaller published size
• c50fd45 Update my email
• 9a31548 3.2.0
• 979dc2d Merge branch 'tyankatsu0105-master'
• fb81da2 chore: update declaration
• 3c53424 chore: declaration
• af399ef 3.1.0

See the full diff

Check the changes in this PR to ensure they won't cause issues with your project.

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