[whatwg/fetch] [3.0.0] SSR build error after update from 2.0.4 (#820)

I'm building my React app with `react-ststic` and deploy to netlify. I see this error after update from whatwg-fetch@2.0.4 to @3.0.0
```
1:50:26 PM:   ReferenceError: self is not defined
1:50:26 PM:   
1:50:26 PM:   - fetch.umd.js:8 
1:50:26 PM:     [repo]/[whatwg-fetch]/dist/fetch.umd.js:8:40
1:50:26 PM:   
1:50:26 PM:   - fetch.umd.js:2 support.searchParams
1:50:26 PM:     [repo]/[whatwg-fetch]/dist/fetch.umd.js:2:66
1:50:26 PM:   
1:50:26 PM:   - fetch.umd.js:5 Object.<anonymous>
1:50:26 PM:     [repo]/[whatwg-fetch]/dist/fetch.umd.js:5:2
1:50:26 PM:   
1:50:26 PM:   - loader.js:689 Module._compile
1:50:26 PM:     internal/modules/cjs/loader.js:689:30
```

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