feat(Galen): Use Galen version 2.4.0

Author: hypery2k

core/package.json

@@ -75,5 +75,5 @@
         "node": ">= 8",
         "npm": ">= 5"
     },
-    "_galenVersion": "2.3.7"
-}
+    "_galenVersion": "2.4.0"
+}