examples: linux: Add sleep between refreshes

Doing it too quickly results in:

called `Result::unwrap()` on an `Err` value: I2c(I2CError { err: Errno(121) })

Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

examples/linux.rs

@@ -20,9 +20,10 @@ fn main() {
         }
         println!();
         println!();
+
         sensor.refresh().unwrap();
+        thread::sleep(Duration::from_millis(100));
         sensor.refresh_v().unwrap();
-
         thread::sleep(Duration::from_millis(100));
     }
 }