Add dependence py-python-louvain to mam

This pull request adds a new required dependence py-python-louvain for model multi-area model.

packages/wf-multi-area-model/package.py

@@ -28,6 +28,7 @@ class WfMultiAreaModel(Package):
     depends_on("py-elephant", type=("run", "test"))
     depends_on("r-aod", type=("run", "test"))
     depends_on("py-notebook", type=("run", "test"))
+    depends_on("py-python-louvain", type=("run", "test"))
 
     def install(self, spec, prefix):
         install_tree(".", join_path(prefix, "notebooks"))