fixes for django2

maraudes/urls.py

@@ -4,6 +4,8 @@ from django.conf.urls import url
 
 from . import views
 
+app_name = "maraudes"
+
 urlpatterns = [
     url(r'^$', views.IndexView.as_view(), name="index"),
     url(r'^compte-rendu$', views.redirect_to_current_compterendu, name="cr-link"),