fixed bug where led state got wrong state.

src/lib.rs

@@ -77,16 +77,19 @@ impl<OP: OutputPin, IP: InputPin> LedButton<OP, IP> {
     /// set the LED to "On"-state.
     pub fn on(&mut self) {
         let _ = self.led.on();
+        self.led_state == LedState::On;
     }
 
     /// set the LED to "Off"-state.
     pub fn off(&mut self) {
         let _ = self.led.off();
+        self.led_state == LedState::Off;
     }
 
     /// toggle the LED.
     pub fn toggle(&mut self) {
         let _ = self.led.toggle();
+        self.led_state = !self.led_state;
     }
 
     /// the current counter value of the button.