Merge pull request #66 from YJammak/YJammak-patch-1

Update README.md

Author: YJammak

README.md

@@ -1,7 +1,7 @@
 # Weather
 用WPF写的日历天气桌面小程序
 
-- .NET 6.0
+- .NET 7.0
 - Visual Studio 2022
 - MVVM（ReactiveUI）