docs: add note about browserslist

Author: satya164

README.md

@@ -148,7 +148,7 @@ Enable compiling source files with Babel and use commonjs module system.
 
 This is useful for running the code in Node (SSR, tests etc.). The output file should be referenced in the `main` field of `package.json`.
 
-By default, this will compile the code for last 2 versions of modern browsers, as well as JSX. It'll also strip TypeScript and Flow annotations. To customize the babel config used, you can pass the [`configFile`](https://babeljs.io/docs/en/options#configfile) or [`babelrc`](https://babeljs.io/docs/en/options#babelrc) options.
+By default, this will compile the code for last 2 versions of modern browsers, as well as JSX. It'll also strip TypeScript and Flow annotations. You can customize the environments to compile for by using a [browserslist config](https://github.com/browserslist/browserslist#config-file). To customize the babel config used, you can pass the [`configFile`](https://babeljs.io/docs/en/options#configfile) or [`babelrc`](https://babeljs.io/docs/en/options#babelrc) options.
 
 If your source code is written in [Flow](http://www.typescriptlang.org/), You can also specify the `copyFlow` option to copy the source files as `.js.flow` to the output folder. If the `main` entry in `package.json` points to the `index` file in the output folder, the flow type checker will pick these files up to use for type definitions.