chore(package): update expect to version 1.13.4

http://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -19,7 +19,7 @@
     "ware": "1.3.0"
   },
   "devDependencies": {
-    "expect": "1.13.3",
+    "expect": "1.13.4",
     "istanbul": "0.4.1",
     "mocha": "2.3.4",
     "mocha-clean": "1.0.0",