Dependency added

package.json

@@ -5,7 +5,8 @@
     "synopsis": "A library to use Constraint Handling Rules in Curry programs",
     "category": [ "Constraints" ],
     "dependencies": {
-        "prolog": ">= 1.0.0"
+        "flatcurry": ">= 2.0.0",
+        "prolog"   : ">= 1.0.0"
     },
     "exportedModules": [ "CHR" ],
     "description": "This library an implementation of Constraints Handling