Fix broken links (#244)

Author: Maicol Castro

README.md

@@ -10,9 +10,9 @@ Serial is a class that provides the basic interface common to serial libraries (
 
 ### Documentation
 
-Website: http://wjwwood.github.com/serial/
+Website: http://wjwwood.github.io/serial/
 
-API Documentation: http://wjwwood.github.com/serial/doc/1.1.0/index.html
+API Documentation: http://wjwwood.github.io/serial/doc/1.1.0/index.html
 
 ### Dependencies