[Snyk] Security upgrade sw-precache from 5.2.0 to 5.2.1

[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
	Prototype Pollution SNYK-JS-MINIMIST-559764	No	Proof of Concept

Commit messages

Package name: sw-precache

The new version differs by 8 commits.

• 2ee24a9 rev update-notifier (#344)
• 19596a2 Update README.md, CLI option clarified (#337)
• c3c4844 Merge pull request #331 from GoogleChromeLabs/cleanup-links
• ec9d792 Additional GoogleChromeLabs link cleanup
• 1dcb0ae Fix dead links in README.md (#329)
• 87264cc Added a Support section (#328)
• 7b1b4f8 Update reference on 'updatefound' event (#317)
• 3ae9bb9 Fix typo (#315)

See the full diff

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

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