Bump pm2 from 4.2.0 to 5.1.0 (#463)

Bumps [pm2](https://github.com/Unitech/pm2) from 4.2.0 to 5.1.0.
- [Release notes](https://github.com/Unitech/pm2/releases)
- [Changelog](https://github.com/Unitech/pm2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Unitech/pm2/commits)

---
updated-dependencies:
- dependency-name: pm2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -86,7 +86,7 @@
     "passport": "^0.4.0",
     "passport-http-bearer": "^1.0.1",
     "passport-jwt": "4.0.0",
-    "pm2": "^4.2.0",
+    "pm2": "^5.1.0",
     "pug": "^3.0.1",
     "uuid": "^3.1.0",
     "winston": "^3.1.0"