Update to Rx.NET 4.2

[clairernovotny]

Rx.NET 4.2 was just released. Aside from bug fixes, the main new feature is support for WPF/WinForms on .NET Core 3.

[open-collective-bot]

Hey @onovotny 👋,

Thank you for opening an issue. We will get back to you as soon as we can. Also, check out our Open Collective and consider contributing financially.

https://opencollective.com/reactiveui

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ReactiveUI - Open Collective

An advanced, composable, functional reactive model-view-viewmodel framework for all .NET platforms!