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:clean-css:20180306
- https://snyk.io/vuln/npm:constantinople:20180421
- https://snyk.io/vuln/npm:cryptiles:20180710
- https://snyk.io/vuln/npm:debug:20170905
- https://snyk.io/vuln/npm:deep-extend:20180409
- https://snyk.io/vuln/npm:extend:20180424
- https://snyk.io/vuln/npm:fresh:20170908
- https://snyk.io/vuln/npm:hoek:20180212
- https://snyk.io/vuln/npm:lodash:20180130
- https://snyk.io/vuln/npm:mime:20170907
- https://snyk.io/vuln/npm:moment:20170905
- https://snyk.io/vuln/npm:sshpk:20180409
- https://snyk.io/vuln/npm:stringstream:20180511
- https://snyk.io/vuln/npm:tough-cookie:20170905

nmaggioni/Dumpster,nmaggioni/Dumpster