Add missing set_direction in main example.

Author: pheki

README.md

@@ -50,6 +50,7 @@ use std::time::Duration;
 fn main() {
     let my_led = Pin::new(127); // number depends on chip, etc.
     my_led.with_exported(|| {
+        my_led.set_direction(Direction::Out).unwrap();
         loop {
             my_led.set_value(0).unwrap();
             sleep(Duration::from_millis(200));

src/lib.rs

@@ -31,6 +31,7 @@
 //! fn main() {
 //!     let my_led = Pin::new(127); // number depends on chip, etc.
 //!     my_led.with_exported(|| {
+//!         my_led.set_direction(Direction::Out).unwrap();
 //!         loop {
 //!             my_led.set_value(0).unwrap();
 //!             sleep(Duration::from_millis(200));