docs: add node version warning. (#65)

ulivz · yyx990803 · commit edf3e5e7a18d · 2018-04-16T08:32:26.000-04:00
diff --git a/README.md b/README.md
@@ -37,6 +37,8 @@ Contributions are welcome!
 
 ## Development
 
+> Please make sure your version of Node.js is greater than 8.
+
 ``` bash
 yarn
 yarn dev # serves VuePress' own docs with itself
diff --git a/docs/README.md b/docs/README.md
@@ -28,3 +28,7 @@ vuepress dev
 # build to static files
 vuepress build
 ```
+
+::: warning NODE VERSION
+Please make sure your version of Node.js is greater than 8.
+:::
