fix: .snyk & package.json to reduce vulnerabilities
fix: .snyk & package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:hoek:20180212


The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/npm:tunnel-agent:20170305

dkocich/osm-pt-ngx-leaflet,dkocich/osm-pt-ngx-leaflet,dkocich/osm-pt-ngx-leaflet