Include pin active low logic

Author: ryankurte

src/lib.rs

@@ -121,11 +121,15 @@ impl hal::digital::OutputPin for Pin {
 
 impl hal::digital::InputPin for Pin {
     fn is_high(&self) -> bool{
-        self.0.get_value().unwrap() != 0
+        if !self.0.get_active_low().unwrap() {
+            self.0.get_value().unwrap() != 0
+        } else {
+            self.0.get_value().unwrap() == 0
+        }
     }
 
     fn is_low(&self) -> bool{
-        self.0.get_value().unwrap() == 0 
+        !self.is_high()
     }
 }