[js] Add missing npm dep

Author: pmurias

src/vm/js/nqp-runtime/package.json

@@ -26,6 +26,7 @@
     "nqp-js-ucd": "0.0.1",
     "stack-trace": "0.0.10",
     "shortid": "2.2.8",
-    "source-map": "0.5.7"
+    "source-map": "0.5.7",
+    "char-props": "0.1.5"
   }
 }