Update dependency offline-plugin to v5

[renovate]

This Pull Request updates dependency offline-plugin from ^4.8.5 to ^5.0.0

Release Notes

v5.0.2

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Fixes incompatibility with hard-source-webpack-plugin by utilizing newer (webpack 2+) loaders injection into NFM "after-resolve" https://github.com/mzgoddard/hard-source-webpack-plugin/issues/289

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v5.0.1

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Fix usage of the plugin without options #​377

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v5.0.0

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v5.0.0 🎉

Breaking changes:

• Support of Node 4 has been dropped #​353
• Support of webpack 1 has been dropped #​353
• AppCache is now disabled by default (celebrating ServiceWorker release in Safari and Edge), but can be enabled again with AppCache: true or more detailed AppCache options
• ServiceWorker.navigateFallbackURL and ServiceWorker.navigateFallbackForRedirects have been deprecated since 4.9.0 and now are dropped. Use appShell option instead. Also see updated SPA example with appShell option #​335
• ServiceWorker.prefetchRequest.credentials is now default to 'same-origin'
• Undocumented "loaders" feature has been removed

Updates

• webpack 4 is supported now 🎉 #​353, #​357
• Fixture tests has been updated to run against webpack 2-4, and more browser tests has been written
• Added ServiceWorker.updateViaCache option (reflecting the same option on ServiceWorker's register() method)
• Fixed issue with additional caches not being added at all when one of them failed to load, preventing caches from being updated/refetched later

Many thanks to @​ykzts for his great work on porting minify option and UglifyJsPlugin in general to work together with offline-plugin and webpack 4. 🙌🙏❤️
Thanks to @​GGAlanSmithee for helping with the docs throughout the releases and for his general guiding 👌

And the last, but not least: Thanks to our SPONSORS and BACKERS for supporting the project! You're the best! ⭐️🎉

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This PR has been generated by Renovate Bot.

[edmorley]

So from reading the release notes it seems that the previous version wasn't webpack 4 compatible (NekR/offline-plugin#351).

I guess the problem is that for any presets (such as @neutrinojs/pwa) that are not covered by the create-project test - we only validate toConfig() and nothing more.