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:hoek:20180212
- https://snyk.io/vuln/npm:hoek:20180212

Latest report for jerrythomas/curious-api:
https://snyk.io/test/github/jerrythomas/curious-api
jerrythomas/curious-api,jerrythomas/curious-api