Error adding same hostname if it is the last in the previous entry

[areYouLazy]

Let's say I've an entry like:
1.1.1.1 my.dns

If I add an entry like
2.2.2.2 my.dns

the library goes in out-of-bound trying to remove the hostname from the previous entry
This goes well if the 1st entry has more than 1 hostname, like
1.1.1.1 my.dns my.second.dns

[areYouLazy]

The problem should be here

libhosty/hosty.go

Line 267 in c14e286

h.HostsFileLines[idx].Hostnames = append(h.HostsFileLines[idx].Hostnames[:hostIdx], h.HostsFileLines[idx].Hostnames[hostIdx+1:]...)

We need to check if it's the last entry before removing it using the append() method