Update README.md

README.md

@@ -27,6 +27,7 @@ marked:
   smartLists: true
   smartypants: true
   modifyAnchors: ''
+  autolink: true
 ```
 
 - **gfm** - Enables [GitHub flavored markdown](https://help.github.com/articles/github-flavored-markdown)
@@ -37,6 +38,7 @@ marked:
 - **smartLists** - Use smarter list behavior than the original markdown.
 - **smartypants** - Use "smart" typograhic punctuation for things like quotes and dashes.
 - **modifyAnchors** - Use for transform anchorIds. if 1 to lowerCase and if 2 to upperCase.
+- **autolink** - Enable autolink for URLs. E.g. `http://hexo.io` will become `<a herf="http://hexo.io">http://hexo.io</a>`.
 
 [Markdown]: http://daringfireball.net/projects/markdown/
-[marked]: https://github.com/chjj/marked
+[marked]: https://github.com/chjj/marked