Update README.md

Author: offboarded-x233534

README.md

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 This project provides [SVG](http://de.wikipedia.org/wiki/Scalable_Vector_Graphics)-shapes for the [Enterprise Integration Patterns](http://www.eaipatterns.com/toc.html) that are intended to be used with [Gliffy](http://www.gliffy.com/).
 
-See the [project page](http://comsysto.github.io/enterprise-integration-pattern-shapes-for-gliffy/) for full documentation and **[usage guide](http://comsysto.github.io/enterprise-integration-pattern-shapes-for-gliffy/#usage-guide)**.
+See the [project page](https://comsysto.github.io/enterprise-integration-pattern-shapes-for-gliffy/) for full documentation and **[usage guide](https://comsysto.github.io/enterprise-integration-pattern-shapes-for-gliffy/#usage-guide)**.
 
 Here is a picture of some shapes so that you get an idea:
 ![](https://comsysto.github.io/enterprise-integration-pattern-shapes-for-gliffy/docimg/demo.png)