readme: fixed dead link

Author: mxschmitt

README.md

@@ -4,7 +4,7 @@
 [![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
 [![Build Status](https://secure.travis-ci.org/JonasProgrammer/docker-machine-driver-hetzner.png)](http://travis-ci.org/JonasProgrammer/docker-machine-driver-hetzner)
 
-> This library adds the support for creating [Docker machines](https://github.com/docker/machine) hosted on the [Hetzner Cloud](hetzner.de/cloud). 
+> This library adds the support for creating [Docker machines](https://github.com/docker/machine) hosted on the [Hetzner Cloud](https://www.hetzner.de/cloud). 
 
 You need to create a project-specific access token under `Access` > `API Tokens` in the project control panel
 and pass that to `docker-machine create` with the `--hetzner-api-token` option.