Fix Unhandled Promise Rejection Warning

[jbmoelker]

Warning produced on every run:

UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): TypeError: Cannot read property '_destroySSL' of undefined
(node:55549) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

How to find the cause of Unhandled Promise Rejection Warnings.

[jbmoelker]

Seems due to known lighthouse issue. That issue has been closed but isn't really resolved if you read along the thread. So probably just have to wait it out and make sure we update our lighthouse dependency.

[patrickhulce]

FYI this should be fixed in master now, will go out with next release