fix: warning native driver

Closes: #4

Author: Marco Cesarato

src/InputValidatorPlaceholder.js

@@ -100,6 +100,7 @@ class InputValidatorPlaceholder extends InputValidator {
             return Animated.timing(
                 labelStyle[prop],
                 {
+                    useNativeDriver: true,
                     toValue: nextStyle[prop],
                     duration: 200
                 },
@@ -173,4 +174,4 @@ InputValidatorPlaceholder.defaultProps = {
     labelstyle: {},
 };
 
-export default InputValidatorPlaceholder;
+export default InputValidatorPlaceholder;