docs: update README

Amour1688 · Amour1688 · commit 5c2ff2df70fa · 2020-07-15T09:52:00.000+08:00
diff --git a/README-zh_CN.md b/README-zh_CN.md
@@ -10,8 +10,6 @@
 
 ```
 npm install @ant-design-vue/babel-plugin-jsx -D
-
-npm install @ant-design-vue/babel-helper-vue-transform-on
 ```
 
 配置 Babel 
diff --git a/README.md b/README.md
@@ -12,8 +12,6 @@ Install the plugin with:
 
 ```
 npm install @ant-design-vue/babel-plugin-jsx -D
-
-npm install @ant-design-vue/babel-helper-vue-transform-on
 ```
 
 Then add the plugin to .babelrc:
