Nginx TLS proxy?

The script seems to be waiting for some sort of input, but I have no idea what to enter:

```bash
$ ./bin/powprox
Pow server names unchanged. Using existing server certificate.
Checking for Nginx… installed with HTTP/2 support.
Checking Nginx config…
nginx: the configuration file /usr/local/etc/nginx/nginx.conf syntax is ok
nginx: configuration file /usr/local/etc/nginx/nginx.conf test is successful
Launching Nginx
Nginx self-test…
Pow upstream: {"pid":1219,"version":"0.6.0","requestCount":169}
Pow with pf port forward: {"pid":1219,"version":"0.6.0","requestCount":170}
Nginx TLS proxy:
```

(this is on High Sierra 10.13.6)

Start with bin/powprox and reproduce the command on macOS High Sierra through the reported “Nginx TLS proxy:” prompt. Determine whether the command expects input or is stalled, and consider the issue resolved when the expected behavior or required input is identified and documented.

Written by the indexing model from the issue text.