Update README.md

Author: huangjia2107

README.md

@@ -40,9 +40,11 @@ xmlns:controls="clr-namespace:MyControl.Controls;assembly=MyControl"
 ![DataSource](images/DataSource_Array.png)
 ``` xml
 <ItemsControl ItemsSource="{Binding .}">
- <ItemsControl.DataTemplate>
- <TextBlock Text="{Binding tag_name}"/>
- </ItemsControl.DataTemplate>
+ <ItemsControl.ItemTemplate>
+ <DataTemplate>
+ <TextBlock Text="{Binding tag_name}"/>
+ </DataTemplate>
+ </ItemsControl.ItemTemplate>
 </ItemsControl>
 ```
 ## Third-Party Notices