fix(package): update @types/sequelize to version 4.27.31

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "yarn": ">=1"
   },
   "dependencies": {
-    "@types/sequelize": "4.27.30",
+    "@types/sequelize": "4.27.31",
     "async": "2.6.1",
     "debug": "4.1.0",
     "joi": "14.0.3",