Merge pull request nestjs#1941 from nestjs/renovate/fastify-2.x

fix(deps): update dependency fastify to v2.2.0

Author: kamilmysliwiec

integration/hello-world/package-lock.json

@@ -14,7 +14,7 @@
     "@nestjs/websockets": "6.0.5",
     "class-transformer": "0.2.0",
     "class-validator": "0.9.1",
-    "fastify": "2.1.0",
+    "fastify": "2.2.0",
     "reflect-metadata": "0.1.13",
     "rxjs": "6.4.0",
     "typescript": "3.4.2"