https-proxy-agent v1 vulnerable

**High            Denial of Service**

**Package**         https-proxy-agent

**Patched in**      >=2.2.0

Dependency of   karma-browserstack-launcher [dev]

**Path**            karma-browserstack-launcher > browserstacktunnel-wrapper >
                  https-proxy-agent

**More info       https://nodesecurity.io/advisories/593**


**Solution:** upgrade to https-proxy-agent ^2.0.0