add more about PostHTML link

Author: voischev

README.md

@@ -3,7 +3,8 @@
 [![Build Status](https://travis-ci.org/posthtml/posthtml-parser.svg?branch=master)](https://travis-ci.org/posthtml/posthtml-parser?branch=master)
 [![Coverage Status](https://coveralls.io/repos/posthtml/posthtml-parser/badge.svg?branch=master)](https://coveralls.io/r/posthtml/posthtml-parser?branch=master)
 
-Parse HTML/XML to [PostHTMLTree](https://github.com/posthtml/posthtml#posthtml-json-tree-example)
+Parse HTML/XML to [PostHTMLTree](https://github.com/posthtml/posthtml#posthtml-json-tree-example). 
+More about (PostHTML)[https://github.com/posthtml/posthtml#readme]
 
 ## Install