docs: recommend v2 to hexo v4

curbengh · curbengh · commit 22f5512c9035 · 2019-11-17T09:40:42.000Z
diff --git a/README.md b/README.md
@@ -12,6 +12,7 @@ Generate Atom 1.0 or RSS 2.0 feed.
 $ npm install hexo-generator-feed --save
 ```
 
+- Hexo 4: 2.x
 - Hexo 3: 1.x
 - Hexo 2: 0.x
 
