feature request: add support for monitoring prefixes

[nusenu]

I guess most tabi users care about entire ASes and use the -a parameter to specify the list of ASes they care about.
It would be great if there were an option to monitor specific prefixes only as well for those that only care about the prefixes they have services in.

thanks!
nusenu

and thanks for making me aware of this tool with your tweet :)
https://twitter.com/guedou/status/997010949335928832