add devdependency

Author: goenning

package.json

@@ -31,6 +31,7 @@
     "express": "^4.13.4",
     "istanbul": "^0.4.3",
     "koa": "^1.2.0",
+    "koa-route": "^2.4.2",
     "mocha": "^2.4.5",
     "pg": "^4.5.5",
     "pug": "^2.0.0-alpha7",