cidr range is off by 1
The cidr range for 192.168.1.1/25 should include 192.168.1.1 to 192.168.1.127 inclusive. 
In file `ip_seg.nim`, the line `last[3] = $(last[3].parseInt() -1)` excludes the final value and should be `last[3] = $(last[3].parseInt())`.

This fix would allow a single IP in cidr notation (192.168.1.1/32) and correct the range to include the last ip in each cidr range