feature request: --minimum-latency <response time ms>

[jessefarinacci]

Thanks for a great tool! I put a few different gping instances inside tmux panes, and it'd be convenient to have each of them with the same relative scale when being rendered inside a more densely populated "dashboard-style" window. So if one of the hosts became slow, which led to a ping latency, the --minimum-latency 300, e.g., would sort of have the necessary "graph slack" to eat the higher ping times and keep all windows graphs at the same local maximum latency/y-axis. This would allow for easier user scanning looking for anomalies.

I'm not partial to that parameter name, I just would appreciate the functionality. If the feature isn't in scope of the project, please just close the request, no problem. Thanks again for a useful tool 👍