added baud rate option

src/main.rs

@@ -22,6 +22,10 @@ struct Cli {
 
     /// The input csv file to read from
     csv_input: PathBuf,
+
+    /// baud rate
+    #[clap(short, long, default_value = "115200")]
+    baud_rate: u32,
 }
 
 fn main() {
@@ -56,7 +60,7 @@ fn main() {
         std::process::exit(1);
     };
     debug!("connecting to for serial port {}...", port_name);
-    let mut port = serialport::new(port_name, 115200)
+    let mut port = serialport::new(port_name, args.baud_rate)
         .open()
         .expect("Failed to open serial port");
     let mut write_port = port.try_clone().expect("Failed to clone");