Update sequelize

package.json

@@ -31,14 +31,13 @@
     "@types/express": "^4.16.0",
     "@types/http-errors": "^1.6.1",
     "@types/lodash": "^4.14.116",
-    "@types/sequelize": "^4.27.24",
     "@types/socket.io": "^1.4.36",
     "@types/tokgen": "^1.0.0",
     "@types/umzug": "^2.2.0",
     "nodemon": "^1.18.3",
     "tslint": "^5.11.0",
     "tslint-config-standard": "^7.1.0",
-    "typescript": "^2.9.2",
+    "typescript": "^3.5.2",
     "typescript-json-schema": "^0.31.0"
   },
   "dependencies": {
@@ -57,7 +56,7 @@
     "pg": "^7.8.0",
     "pg-hstore": "^2.3.2",
     "rate-limiter-flexible": "^0.21.2",
-    "sequelize": "^4.38.0",
+    "sequelize": "^5.8.12",
     "socket.io": "^2.1.1",
     "tokgen": "^1.0.0",
     "umzug": "^2.1.0"