build(deps): bump sequelize from 5.8.6 to 5.8.7

Bumps [sequelize](https://github.com/sequelize/sequelize) from 5.8.6 to 5.8.7.
- [Release notes](https://github.com/sequelize/sequelize/releases)
- [Commits](sequelize/sequelize@v5.8.6...v5.8.7)

Author: dependabot-preview[bot]

package-lock.json

@@ -79,7 +79,7 @@
     "pm2": "^3.5.1",
     "request": "^2.88.0",
     "request-promise": "^4.2.4",
-    "sequelize": "^5.8.6",
+    "sequelize": "^5.8.7",
     "supertest": "^4.0.2",
     "swig": "^1.4.2",
     "winston": "^3.2.1",