fix(attaching): correct api changes from diagram-js

lib/features/modeling/rules/BpmnRules.js

@@ -68,14 +68,14 @@ BpmnRules.prototype.init = function() {
 
   this.addRule('shapes.move', function(context) {
 
-    var target = context.newParent,
+    var target = context.target,
         shapes = context.shapes;
 
     return canMove(shapes, target);
   });
 
   this.addRule([ 'shape.create', 'shape.append' ], function(context) {
-    var target = context.parent,
+    var target = context.target,
         shape = context.shape,
         source = context.source;