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:express:20150803

Latest report for mlefebvresopra/styleguide:
https://snyk.io/test/github/mlefebvresopra/styleguide
mlefebvresopra/Styleguide,mlefebvresopra/Styleguide