Update usage.md

Updated usage.md to not recommend the use of `[@babel/polyfill](https://babeljs.io/docs/en/babel-polyfill)`, which is deprecated. Solves babel#2171
danBamikiya · Apr 11, 2021 · ab54c54 · ab54c54
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commit ab54c54
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diff --git a/docs/usage.md b/docs/usage.md
@@ -17,7 +17,6 @@ The entire process to set this up involves:
 
    ```sh
    npm install --save-dev @babel/core @babel/cli @babel/preset-env
-   npm install --save @babel/polyfill
    ```
 
 2. Creating a config file named `babel.config.json` (requires `v7.8.0` and above) in the root of your project with this content: