Eleventy Fetch v4.0.0

What's Changed

• Node 14+ required
• dryRun will allow reading of cached files for re-use in serverless contexts, thank you @ryangittings! #28
• Include the response in the error object when a request fails by @arcxyz and @BigBlueHat #21 #29

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Full Milestone: https://github.com/11ty/eleventy-fetch/issues?q=is%3Aclosed+milestone%3A%22Eleventy+Fetch+v4.0.0%22
Full Changelog: v3.0.0...v4.0.0