update stacktrace version - fix #14 (#20)

Author: arnaudvalle

package.json

@@ -34,6 +34,6 @@
     "sinon": "^1.17.4"
   },
   "dependencies": {
-    "stacktrace-js": "^1.3.0"
+    "stacktrace-js": "^2.0.0"
   }
 }