Tentative fix of htmlpreview

README.md

@@ -12,7 +12,7 @@ from [GitHub](https://github.com/jourquin/Nodus/releases).
 
 ## Introduction
 
-Nodus ([Screenshots](http://htmlpreview.github.com/?https://github.com/jourquin/Nodus/blob/master/doc/images/screenshots.html)) 
+Nodus ([Screenshots](http://htmlpreview.github.io/?https://github.com/jourquin/Nodus/blob/master/doc/images/screenshots.html)) 
 implements the "Virtual networks" methodology developed at UCLouvain, an alternative to the classical "four steps" 
 technique to model multimodal and intermodal transport flows over networks, as it combines the "modal choice" 
 and "assignment" phases of the latter in a single step.