support HTTPS with self signed certificate

With the `--ssl` flag now an experimental feature of the Ionic CLI (https://github.com/ionic-team/ionic-cli/issues/3305), devs are able to use livereload using an HTTPS server. This is mostly to test/develop features involving geolocation with livereload.

Right now, livereload with `--ssl` works on Android, but iOS doesn't accept the self-signed certificate, failing to load with the following error:

> 2018-11-15 15:32:09.330613-0600 MyApp[12366:179859] Failed to load webpage with error: The certificate for this server is invalid. You might be connecting to a server that is pretending to be "10.0.0.123" which could put your confidential information at risk.