fix(deps): update dependency @nestjs/swagger to v3.1.0

Author: renovate-bot

sample/11-swagger/package-lock.json

@@ -13,7 +13,7 @@
     "@nestjs/common": "6.5.2",
     "@nestjs/core": "6.5.2",
     "@nestjs/platform-express": "6.5.2",
-    "@nestjs/swagger": "3.0.2",
+    "@nestjs/swagger": "3.1.0",
     "class-transformer": "0.2.3",
     "class-validator": "0.9.1",
     "reflect-metadata": "0.1.13",