Bump nodemon from 1.18.3 to 2.0.4

Bumps [nodemon](https://github.com/remy/nodemon) from 1.18.3 to 2.0.4.
- [Release notes](https://github.com/remy/nodemon/releases)
- [Commits](remy/nodemon@v1.18.3...v2.0.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package.json

@@ -40,7 +40,7 @@
     "@types/supertest": "^2.0.10",
     "@types/winston": "^2.4.4",
     "mocha": "^5.2.0",
-    "nodemon": "^1.18.3",
+    "nodemon": "^2.0.4",
     "power-assert": "^1.6.0",
     "prettier": "^2.0.5",
     "sequelize-cli": "^4.1.0",