Fixes ViewPropTypes errors (#132)

Author: jcde

lib/BaseInput.js

@@ -8,9 +8,9 @@ export default class BaseInput extends Component {
     label: PropTypes.string,
     value: PropTypes.string,
     defaultValue: PropTypes.string,
-    style: ViewPropTypes ? ViewPropTypes.style : View.propTypes.style,
-    inputStyle: Text.propTypes.style,
-    labelStyle: Text.propTypes.style,
+    style: ViewPropTypes ? ViewPropTypes.style : View.propTypes?.style,
+    inputStyle: Text.propTypes?.style,
+    labelStyle: Text.propTypes?.style,
     easing: PropTypes.func,
     animationDuration: PropTypes.number,
     useNativeDriver: PropTypes.bool,