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:debug:20170905
- https://snyk.io/vuln/npm:debug:20170905

Latest report for vaibhavmule/book-library-restful-backbone-app:
https://snyk.io/test/github/vaibhavmule/book-library-restful-backbone-app
vaibhavmule/book-library-restful-backbone-app,vaibhavmule/book-library-restful-backbone-app