fix: try for node 4

Scrum · Scrum · commit 4db1e9a75358 · 2018-02-21T11:31:44.000+03:00
diff --git a/package.json b/package.json
@@ -104,8 +104,7 @@
         {
           "targets": {
             "node": 4
-          },
-          "useBuiltIns": "usage"
+          }
         }
       ],
       [
