--bind not mentioned in README

I am running Bind-Log-Analyzer in a Docker container.

To make the web server accessible to all computers in the LAN, start the tool with the `--bind` switch and bind it to `0.0.0.0`:

```
bind_log_analyzer --webserver 1234 --bind 0.0.0.0 --config /usr/local/bin/bindloganalyzer/database.yml --verbose 3
```

This switch is currently **not** mentioned in README.md