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:qs:20170213
- https://snyk.io/vuln/npm:qs:20170213

Latest report for saganus/macaroons-express-demo:
https://snyk.io/test/github/saganus/macaroons-express-demo
Saganus/macaroons-express-demo,Saganus/macaroons-express-demo