Merge pull request nestjs#2904 from nestjs/renovate/sequelize-5.x

fix(deps): update dependency sequelize to v5.18.4

Author: kamilmysliwiec

sample/07-sequelize/package.json

@@ -16,7 +16,7 @@
     "mysql2": "1.7.0",
     "reflect-metadata": "0.1.13",
     "rxjs": "6.5.3",
-    "sequelize": "5.18.1",
+    "sequelize": "5.18.4",
     "sequelize-typescript": "1.0.0",
     "typescript": "3.5.3"
   },