Update url to semicon

content/extensions.rst

@@ -12,7 +12,7 @@ link to the code and a couple of sentences describing it, and we'll add it to th
 
 Semicon: k·p simulations made easy
 ----------------------------------
-**Get the code**: https://gitlab.kwant-project.org/r-j-skolasinski/semicon
+**Get the code**: https://gitlab.kwant-project.org/semicon/semicon
 
 A package of tools for doing k·p simulations. Contains: model definitions, material parameters,
 and helper functions for generating template Kwant systems.