chore(package): update koa-views to version 5.1.2

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -25,7 +25,7 @@
     "koa-redis": "2.1.2",
     "koa-router": "5.4.0",
     "koa-static": "2.0.0",
-    "koa-views": "4.1.0",
+    "koa-views": "5.1.2",
     "kue": "0.11.1",
     "lodash": "4.16.0",
     "octonode": "0.7.6",