Get the example working with a real lidar

examples/simple_example.rs

@@ -0,0 +1,14 @@
+use rplidar_rs::Lidar;
+use std::time::Duration;
+
+fn main() {
+    let serial = serialport::new("/dev/cu.usbserial-0001", 115200)
+        .timeout(Duration::from_secs(10))
+        .open_native()
+        .expect("Failed to open serial port, check it's available");
+    let mut lidar = Lidar::new(serial);
+    lidar.start_scanning().expect("Failed to start scanning");
+    for scan in lidar {
+        println!("{}", scan.len());
+    }
+}