fix(package): update @nestjs/swagger to version 2.1.0

Closes #18

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
     "@nestjs/common": "^4.5.9",
     "@nestjs/core": "^4.5.9",
     "@nestjs/microservices": "^4.5.8",
-    "@nestjs/swagger": "^1.1.3",
+    "@nestjs/swagger": "^2.1.0",
     "@nestjs/testing": "^4.5.5",
     "@nestjs/typeorm": "^2.0.0",
     "@nestjs/websockets": "^4.5.8",