:arrow_up: Updates isomorphic-unfetch to v4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
isomorphic-unfetch	^3.1.0 -> ^4.0.0

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Release Notes

developit/unfetch (isomorphic-unfetch)

### [`v4.0.2`](https://togithub.com/developit/unfetch/compare/4.0.1...ee5810e7f9cd769677984b159d7e250adf4611b9) [Compare Source](https://togithub.com/developit/unfetch/compare/4.0.1...ee5810e7f9cd769677984b159d7e250adf4611b9) ### [`v4.0.1`](https://togithub.com/developit/unfetch/releases/tag/4.0.1) [Compare Source](https://togithub.com/developit/unfetch/compare/4.0.0...4.0.1) Quick publishing fix. ### [`v4.0.0`](https://togithub.com/developit/unfetch/releases/tag/4.0.0) [Compare Source](https://togithub.com/developit/unfetch/compare/3.1.0...4.0.0) 🦄 **Small breaking change for awesome ponyness:** - `unfetch` is now a pure [ponyfill](https://togithub.com/sindresorhus/ponyfill). - `unfetch/polyfill` is now the polyfill version (even smaller than the ponyfill!) - All modules are shipped in all formats, and the polyfill is now < 500b. - Also a little bugfix for IE11 ([#​85](https://togithub.com/developit/unfetch/issues/85), thanks [@​khusa](https://togithub.com/khusa)) > TL;DR: `require('unfetch')` no longer returns `window.fetch` when it exists. For that, use `unfetch/polyfill`. This change makes unfetch lovely to use as a polyfill from HTML: ```html ``` Otherwise, if you're using Unfetch and bundling your code, continue as you were before: ```js if (!self.fetch) self.fetch = require('unfetch'); // or simply: import 'unfetch/polyfill'; ``` **Important** - the one thing to avoid: > Since unfetch is a proper ponyfill, it will now overwrite `fetch` even in supported browsers if you do the following > > ```js > // never do this! > window.fetch = require('unfetch'); > ```

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Pull request alert summary

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Install scripts	✅ 0 issues
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Invalid package.json	✅ 0 issues
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📊 Modified Dependency Overview:

⬆️ Updated Package	Version Diff	Added Capability Access	+/- Transitive Count	Publisher
isomorphic-unfetch@4.0.2	3.1.0...4.0.2	None	+7/-1	developit

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