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:concat-stream:20160901

Latest report for ra100/sails-social-feed:
https://snyk.io/test/github/ra100/sails-social-feed
ra100/sails-social-feed,ra100/sails-social-feed