Update Testing-Framework-Whitepaper.md

docs/Getting Started/CamiTK Overviews/Testing-Framework-Whitepaper.md

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 # CamiTK Testing Framework Technical Overview
 
-[![By CamiTK Team](https://img.shields.io/badge/by-CamiTK%20Team-green.svg?longCache=true&style=plastic)](https://camitk.imag.fr/)
+[![By CamiTK Team](https://img.shields.io/badge/by-CamiTK%20Team-green.svg?longCache=true&style=plastic)](http://camitk.imag.fr/)
 
 CamiTK provides some tools to test your code at different granularity levels. In this wiki page you will find information about our testing process, what we test and how you can use our already defined tests.