Alphabetize routers

README.md

 
 ## Routers
 *Libraries for handling application routing.*
+
 * [Fast Route](https://github.com/nikic/FastRoute) - A fast routing library.
-* [Route](https://github.com/thephpleague/route) - A routing library built on top of Fast Route.
-* [Pux](https://github.com/c9s/Pux) - Another fast routing library.
 * [Klein](https://github.com/klein/klein.php) - A flexible router.
+* [Pux](https://github.com/c9s/Pux) - Another fast routing library.
+* [Route](https://github.com/thephpleague/route) - A routing library built on top of Fast Route.
 
 ## Templating
 *Libraries and tools for templating and lexing.*