docs: change README.md

Author: yaoleyaotouoO

docs/README.md

@@ -14,6 +14,13 @@ features:
 footer: Open-source MIT Licensed | Copyright © 2019-present
 ---
 
+## 安装
+
+```bash
+$ npm install --save vant@latest-v2
+$ npm install --save @vue/composition-api @formily/vant
+```
+
 ## 快速开始
 
 <dumi-previewer demoPath="index" :collapsed="false" />

docs/demos/index.vue

@@ -4,7 +4,7 @@
       <SchemaStringField
         name="input"
         x-component="Input"
-        :x-component-props="{ label: '输入框', placeholder: '请输入...' }"
+        :x-component-props="{ label: '输入框', placeholder: '请输入' }"
       />
 
       <SchemaStringField