fix(package): update sequelize to version 5.1.0

Author: greenkeeper[bot]

package.json

@@ -70,7 +70,7 @@
     "pm2": "^3.3.1",
     "request": "^2.88.0",
     "request-promise": "^4.2.4",
-    "sequelize": "^4.43.0",
+    "sequelize": "^5.1.0",
     "supertest": "^4.0.0",
     "swig": "^1.4.2",
     "winston": "^3.2.1",