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:auth0-js:20171204

Latest report for impactasaurus/app:
https://snyk.io/test/github/impactasaurus/app
impactasaurus/app,impactasaurus/app,impactasaurus/app