Update: Bump es6-weak-map/last-run & use native WeakMap if available

Author: phated

lib/helpers/metadata.js

@@ -1,8 +1,9 @@
 'use strict';
 
 var WM = require('es6-weak-map');
+var hasNativeWeakMap = require('es6-weak-map/is-native-implemented');
 
 // WeakMap for storing metadata
-var metadata = new WM();
+var metadata = hasNativeWeakMap ? new WeakMap() : new WM();
 
 module.exports = metadata;

package.json

@@ -22,8 +22,8 @@
   },
   "dependencies": {
     "bach": "^0.4.1",
-    "es6-weak-map": "^0.1.2",
-    "last-run": "^0.2.0",
+    "es6-weak-map": "^1.0.1",
+    "last-run": "^1.0.0",
     "lodash": "^3.5.0",
     "undertaker-registry": "0.0.2"
   },