Update documentation link

Author: maciejhirsz

README.md

@@ -9,7 +9,7 @@
 Parse and serialize [JSON](http://json.org/) with ease.
 
 **[Changelog](https://github.com/maciejhirsz/json-rust/releases) -**
-**[Complete Documentation](http://terhix.com/doc/json/) -**
+**[Complete Documentation](http://json.rs/doc/json/) -**
 **[Cargo](https://crates.io/crates/json) -**
 **[Repository](https://github.com/maciejhirsz/json-rust)**