修复自动高度无效

autoHeightWebView/index.js

       [width, height, onSizeUpdated]
     );
     return (
-      <View style={[props.style, { height: height || 50 }]}>
+      <View style={[props.style, { height: height || 20 }]}>
         <WebView
           {...props}
           style={{}}