Change log for each nuget release

[jindal1979]

Dear Moten,

Thanks for making the useful extension for Window. Its really helpful. It could be more helpful if you can release short change log or release notes with every new nuget release, so that we can know the changes or breaking changes in API.

-Munish

[dotMorten]

You can see these on nuget.org https://www.nuget.org/packages/WinUIEx#release-body-tab