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:moment:20170905

Latest report for streetsupport/streetsupport-web:
https://snyk.io/test/github/streetsupport/streetsupport-web

Some vulnerabilities weren't fixed or ignored, and so will still fail
the Snyk test report.
StreetSupport/streetsupport-web,StreetSupport/streetsupport-web,StreetSupport/streetsupport-web