Fix README.md

README.md

@@ -2,21 +2,15 @@
 
 [Swc](https://github.com/swc-project/swc) [jest](https://github.com/facebook/jest) plugin
 
-## Usage
-
-If you are already using `jest-cli`, just add `swc-jest` and it will automatically compile JavaScript code using swc.
+## Install
 
 ```bash
-yarn add --dev swc-jest @swc/core
+npm install --save-dev swc-jest @swc/core
 ```
 
-If you would like to write your own preprocessor, uninstall and delete swc-jest and set the [config.transform](https://jestjs.io/docs/configuration#transform-object-string-string) option to your preprocessor.
-
 ## Setup
 
-_Note: this step is only required if you are using `swc-jest` with additional code preprocessors._
-
-To explicitly define `swc-jest` as a transformer for your JavaScript code, map _.js_ files to the `swc-jest` module.
+You have to define `swc-jest` as a transformer for your JavaScript code, map _.js_ files to the `swc-jest` module.
 
 ```json
 "transform": {