docs: use npm install in README

Author: afc163

README.md

@@ -53,7 +53,7 @@ Online preview: https://segmented.react-component.vercel.app/
 Run the local dumi site:
 
 ```bash
-ut install
+npm install
 npm start
 ```
 
@@ -96,7 +96,7 @@ Additional valid `div` props are passed to the root element.
 ## Development
 
 ```bash
-ut install
+npm install
 npm start
 npm test
 npm run tsc

README.zh-CN.md

@@ -52,7 +52,7 @@ export default () => (
 运行本地 dumi 站点：
 
 ```bash
-ut install
+npm install
 npm start
 ```
 
@@ -95,7 +95,7 @@ npm start
 ## 本地开发
 
 ```bash
-ut install
+npm install
 npm start
 npm test
 npm run tsc