fix(package): update @nestjs/swagger to version 2.4.6

Closes #11

Author: greenkeeper[bot]

package.json

@@ -13,7 +13,7 @@
     "@nestjs/common": "^4.5.9",
     "@nestjs/core": "^4.5.10",
     "@nestjs/microservices": "^4.5.8",
-    "@nestjs/swagger": "^1.1.4",
+    "@nestjs/swagger": "^2.4.6",
     "@nestjs/testing": "^4.5.5",
     "@nestjs/websockets": "^4.5.8",
     "js-yaml": "^3.11.0",