chore(package): update fastify to version 2.0.0 (#26)

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
   },
   "homepage": "https://github.com/fastify/fastify-redis#readme",
   "devDependencies": {
-    "fastify": "^1.9.0",
+    "fastify": "^2.0.0",
     "standard": "^12.0.0",
     "tap": "^12.0.1"
   },