Bump sequelize from 3.14.2 to 5.21.1 in /todoapp/nodejs

dependabot[bot]

2019-10-23 2eac59e25e9692aea2eabe0bbb01a41cbf79166c

 todoapp/nodejs/package.json

@@ -4,7 +4,7 @@
  "private": true,
  "dependencies": {
    "restify": "4.0.3",
    "sequelize": "3.14.2",
    "sequelize": "5.21.1",
    "mysql": "2.9.0"
  }
}