use --command-name for the long option

doc/hyperfine.1

@@ -164,7 +164,7 @@ Print the stdout and stderr of the benchmark instead of suppressing it. This
 will increase the time it takes for benchmarks to run, so it should only be
 used for debugging purposes or when trying to benchmark output speed.
 .HP
-\fB\-\-name\fR \fIname\fP
+\fB\-n\fR, \fB\-\-command\-name\fR \fIname\fP
 .IP
 Identify a command with the given \fIname\fP. Commands and names are paired in
 the same order: the first command executed gets the first name passed as

src/hyperfine/app.rs

@@ -228,7 +228,7 @@ fn build_app() -> App<'static, 'static> {
         )
         .arg(
             Arg::with_name("command-name")
-                .long("name")
+                .long("command-name")
                 .short("n")
                 .takes_value(true)
                 .multiple(true)