fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ENGINEIO-3136336
- https://snyk.io/vuln/SNYK-JS-GLOBPARENT-1016905
- https://snyk.io/vuln/SNYK-JS-LODASH-1018905
- https://snyk.io/vuln/SNYK-JS-LODASH-1040724
- https://snyk.io/vuln/SNYK-JS-LODASH-450202
- https://snyk.io/vuln/SNYK-JS-LODASH-608086
- https://snyk.io/vuln/SNYK-JS-LODASH-73638
- https://snyk.io/vuln/SNYK-JS-LODASH-73639
- https://snyk.io/vuln/SNYK-JS-LOG4JS-2348757
- https://snyk.io/vuln/SNYK-JS-MINIMIST-2429795
- https://snyk.io/vuln/SNYK-JS-MINIMIST-559764
- https://snyk.io/vuln/SNYK-JS-SOCKETIO-1024859
- https://snyk.io/vuln/SNYK-JS-SOCKETIOPARSER-1056752
- https://snyk.io/vuln/SNYK-JS-SOCKETIOPARSER-3091012
- https://snyk.io/vuln/SNYK-JS-UNSETVALUE-2400660
- https://snyk.io/vuln/SNYK-JS-USERAGENT-174737
- https://snyk.io/vuln/SNYK-JS-WS-1296835
- https://snyk.io/vuln/SNYK-JS-XMLHTTPREQUESTSSL-1082936
- https://snyk.io/vuln/SNYK-JS-XMLHTTPREQUESTSSL-1255647
- https://snyk.io/vuln/npm:braces:20180219
- https://snyk.io/vuln/npm:lodash:20180130