Fixed tfm related differs.

Author: kekyo

FSharp.FlashCap/FSharp.FlashCap.fsproj

@@ -1,11 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net48;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>net48;netstandard2.0;netstandard2.1;net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
     <IsPackable>true</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" PrivateAssets="All" />
     <PackageReference Update="FSharp.Core" Version="5.0.0" />
   </ItemGroup>
 

FSharp.FlashCap/PixelBufferExtension.fs

@@ -11,6 +11,8 @@ namespace FlashCap
 
 open System.Diagnostics
 
+#nowarn 3261
+
 [<AutoOpen>]
 module public PixelBufferExtension =
 

FlashCap/FlashCap.csproj

@@ -6,6 +6,10 @@
     <IsPackable>true</IsPackable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" PrivateAssets="All" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\FlashCap.Core\FlashCap.Core.csproj" />
   </ItemGroup>