--range <start-end>, only contain start, But not end port

[zhikai-yang]

In nmap run：nmap 192.168.1.2 -p 1-65535 ,nmap scan port range is 1-65535.
But in RustScan run：rustscan 192.168.1.2 --range 1-65535 (or directly execute rustscan 192.168.1.2) by wireshark verification, the scan range is 1-65534, does not contain 65535.

The same in nmap exec: nmap 192.168.1.2 -p 1-5, nmap scan range is 1-5.
But in the RustScan exec: rustscan 192.168.1.2 --range 1-5, rustscan scan range is 1-4.

Please fix this bug. Services open on 65535 may be missed when execute full port scan.