chore(package): update serve to version 5.0.3 (#83)

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -15,7 +15,7 @@
   "devDependencies": {
     "expect.js": "0.3.1",
     "mocha": "3.0.2",
-    "serve": "5.0.2",
+    "serve": "5.0.3",
     "xo": "0.17.0"
   },
   "component": {