Panic is used in library instead of returning error

[isodude]

At https://github.com/tonobo/mtr/blob/1c17592ae70b6710d37a17f81813a4551961b10d/pkg/icmp/icmp.go#L43 the code is throwing a panic, which when using this code as a library is quite devastating.

I'm using it for a mtr plugin in telegraf.