docs: add internet explorer section in readme

Author: devrnt

README.md

@@ -63,6 +63,7 @@ const Step1 = () => {
 - [Examples](#examples)
 - [Async](#async)
 - [Animation](#animation)
+- [IE11](#ie11)
 
 ## API
 
@@ -227,3 +228,8 @@ If an async function is attached to `handleStep` the `isLoading` property will i
 Since `react-use-wizard` is focused to manage the logic of a wizard it doesn't mean you can't add some animation by your own. Add any animation library that you like. I highly suggest [framer-motion](https://www.framer.com/motion/) to add your animations.
 
 Checkout this [example](https://github.com/devrnt/react-use-wizard/blob/main/playground/components/animatedStep.tsx) to see how a step can be animated with framer motion. 
+
+## IE11
+Since Internet Explorer 11 doesn't support promises or async functions you'll need to install a polyfill for the `regenerator-runtime`.
+
+In general using [react-app-polyfill](https://www.npmjs.com/package/react-app-polyfill) is recommended, it includes polyfills for various browsers.