Merge pull request #454 from canjs/greenkeeper/zombie-6.0.0

Update zombie to the latest version 🚀

Author: chasenlehara

package.json

@@ -70,6 +70,6 @@
     "steal-tools": "^1.8.2",
     "test-saucelabs": "0.0.3",
     "testee": "^0.7.0",
-    "zombie": "^5.0.5"
+    "zombie": "^6.0.0"
   }
 }