Merge pull request #762 from mamat-rahmat/fix-broken-di-link

Fix broken link

Author: philsturgeon

_posts/06-05-01-Further-Reading.md

@@ -9,4 +9,4 @@ anchor:  further_reading
 * [What is Dependency Injection?](http://fabien.potencier.org/article/11/what-is-dependency-injection)
 * [Dependency Injection: An analogy](https://mwop.net/blog/260-Dependency-Injection-An-analogy.html)
 * [Dependency Injection: Huh?](http://net.tutsplus.com/tutorials/php/dependency-injection-huh/)
-* [Dependency Injection as a tool for testing](http://philipobenito.github.io/dependency-injection-as-a-tool-for-testing/)
+* [Dependency Injection as a tool for testing](https://medium.com/philipobenito/dependency-injection-as-a-tool-for-testing-902c21c147f1)