fix: ensure correct version on packaged assemblies

Author: panesofglass

src/Directory.Build.props

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="utf-8" standalone="no"?>
 <Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
+    <VersionPrefix>6.1.0</VersionPrefix>
+    <Version>$(Version)</Version>
     <Authors>Ryan Riley;Steffen Forkmann;Jared Hester</Authors>
     <Summary>A F#-friendly wrapper for the Reactive Extensions.</Summary>
     <Description>A F#-friendly wrapper for the Reactive Extensions.</Description>

src/FSharp.Control.Reactive.Testing/FSharp.Control.Reactive.Testing.fsproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
+    <Version>$(Version)</Version>
   </PropertyGroup>
   <ItemGroup>
     <None Include="paket.references" />
@@ -14,4 +15,4 @@
     <ProjectReference Include="..\FSharp.Control.Reactive\FSharp.Control.Reactive.fsproj" />
   </ItemGroup>
   <Import Project="..\..\.paket\Paket.Restore.targets" />
-</Project>
+</Project>

src/FSharp.Control.Reactive/FSharp.Control.Reactive.fsproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
      <TargetFrameworks>net472;netstandard2.0;net6.0</TargetFrameworks>
+     <Version>$(Version)</Version>
   </PropertyGroup>
   <Target Name="ConfigureTrimming" BeforeTargets="PrepareForILLink">
     <ItemGroup>