Update dependency offline-plugin to v4.9.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
offline-plugin	devDependencies	minor	4.8.3 -> 4.9.1

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Release Notes

NekR/offline-plugin

v4.9.1

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• Fix isNotRedirectedResponse function is used without an argument #​370

v4.9.0

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New features:

• Added appShell option. See docs here
• Added ServiceWorker.navigationPreload option. See docs here
• Added browser tests with puppeteer. See tests here

Fixes:

• Exclude *.gz files by default #​133

Deprecations:

• ServiceWorker.navigateFallbackURL and ServiceWorker.navigateFallbackForRedirects are now deprecated. Use appShell or cacheMaps option.

Many thanks to @​GGAlanSmithee for helping with and maintaining documentation of the project! 🎉

v4.8.5

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• Fixed compatibility with webpack 4 Alpha

v4.8.4

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• Make sure AppCache's postMessage events do not conflict with other libraries/tools #​305

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