Document from which version of browsers we don't need to use the library

Hello,

With all major browsers supporting fetch since years ago, and already with the warn about browser support should we make it more explicit from which version of each browser we don't need this polifyll ? Also what about warn users if they try to use it in a browser that already supports fetch ?

Example something like this:

⚠️ Browser Support Notice

Do not use this polyfill if you only target modern browsers.

All currently maintained browsers provide a native, standards-compliant fetch implementation. Including whatwg-fetch in these environments is unnecessary and adds extra bundle size.

Browsers where whatwg-fetch is NOT needed

Browser	Minimum version with native fetch
Chrome	42+
Firefox	39+
Edge (Chromium)	All versions
Edge (Legacy)	14+
Safari (macOS)	10.1+
Safari (iOS)	10.3+
Opera	29+
Samsung Internet	4.0+

If your supported browser list only includes the versions above (or newer), do not install or import this polyfill.