Backend upgrade

nicolasstucki · nicolasstucki · commit 605afc80650c · 2017-11-27T17:29:17.000+01:00
diff --git a/scala-backend b/scala-backend
@@ -1 +1 @@
-Subproject commit 31f96813dc8282a685728ae5769f7c1004d89e3a
+Subproject commit b4f91888b6e778fd1ea0aee2dbf832ae8b59a48a
