Update BlazorGetStartedWebAssemblyPackageVersion (dotnet#16752)

Author: guardrex

aspnetcore/blazor/get-started.md

@@ -5,7 +5,7 @@ description: Get started with Blazor by building a Blazor app with the tooling o
 monikerRange: '>= aspnetcore-3.1'
 ms.author: riande
 ms.custom: mvc
-ms.date: 12/18/2019
+ms.date: 01/28/2019
 no-loc: [Blazor, SignalR]
 uid: blazor/get-started
 ---
@@ -24,7 +24,7 @@ Get started with Blazor:
    * Run the following command in a command shell. The [Microsoft.AspNetCore.Blazor.Templates](https://www.nuget.org/packages/Microsoft.AspNetCore.Blazor.Templates/) package has a preview version while Blazor WebAssembly is in preview.
 
    ```dotnetcli
-   dotnet new -i Microsoft.AspNetCore.Blazor.Templates::3.1.0-preview4.19579.2
+   dotnet new -i Microsoft.AspNetCore.Blazor.Templates::3.2.0-preview1.20073.1
    ```
 
 1. Follow the guidance for your choice of tooling: