Fix readme thanks section

Author: rstacruz

README.md

@@ -30,11 +30,11 @@ See [API documentation](docs/api.md).
 ## Thanks
 
 **styledown2-rails** © 2017+, Rico Sta. Cruz. Released under the [MIT] License.<br>
-** © 2017+, Rico Sta. Cruz. Released under the [MIT] License.<br>
 Authored and maintained by Rico Sta. Cruz with help from contributors ([list][contributors]).
 
 > [ricostacruz.com](http://ricostacruz.com) &nbsp;&middot;&nbsp;
 > GitHub [@rstacruz](https://github.com/rstacruz) &nbsp;&middot;&nbsp;
 > Twitter [@rstacruz](https://twitter.com/rstacruz)
 
+[MIT]: http://mit-license.org/
 [contributors]: http://github.com/styledown/styledown2-rails/contributors