refactor: Remove unused Shell import from clap_complete

Author: code-inflation

src/main.rs

@@ -2,7 +2,7 @@ use cfspeedtest::speedtest;
 use cfspeedtest::OutputFormat;
 use cfspeedtest::SpeedTestCLIOptions;
 use clap::{CommandFactory, Parser};
-use clap_complete::{generate, Shell};
+use clap_complete::generate;
 use std::io;
 use std::net::IpAddr;