Merge pull request nestjs#3692 from nestjs/renovate/nestjs-bull-0.x

fix(deps): update dependency @nestjs/bull to v0.0.1-beta.4

Author: kamilmysliwiec

sample/26-queues/package-lock.json

@@ -19,7 +19,7 @@
     "test:e2e": "echo 'No e2e tests implemented yet.'"
   },
   "dependencies": {
-    "@nestjs/bull": "0.0.1-beta.3",
+    "@nestjs/bull": "0.0.1-beta.4",
     "@nestjs/common": "6.10.9",
     "@nestjs/core": "6.10.9",
     "@nestjs/platform-express": "6.10.9",