fix: package.json to reduce vulnerabilities
fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:ms:20170412

Latest report for pjmolina/event-backend:
https://snyk.io/test/github/pjmolina/event-backend
pjmolina/event-backend,pjmolina/event-backend,pjmolina/event-backend