For yarn user, sync from chinese document

ant-design · Jan 3, 2020 · 9a915ec · 9a915ec
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commit 9a915ec
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diff --git a/README.md b/README.md
@@ -15,6 +15,8 @@ Before run codemod scripts, you'd better make sure to commit your local git chan
 ```shell
 # global installation
 npm i -g @ant-design/codemod-v4
+# or for yarn user
+#  yarn global add @ant-design/codemod-v4
 antd4-codemod src
 
 # use npx