v0.2.0: multi-target net8.0 alongside net10.0

Retarget the package from net10.0-only to net8.0;net10.0 so .NET 8 CLIs
can consume it directly. No API or behaviour changes — every dependency
already ships net8.0 assets and no net9+-only APIs are used.

- src csproj: TargetFramework -> TargetFrameworks net8.0;net10.0; bump 0.1.10 -> 0.2.0
- Directory.Build.props: drop the singular TargetFramework so TargetFrameworks
  is honoured (tests/demo declare their own TFM)
- CHANGELOG: 0.2.0 entry

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: StuartMeeks

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ---
 
+## [0.2.0] — 2026-06-20
+
+### Changed
+
+- **The package now multi-targets `net8.0` alongside `net10.0`** (previously `net10.0` only). .NET 8 CLIs can now consume the library directly instead of being forced onto the latest runtime. No API or behaviour changes — every public surface and feature is identical across both targets, and all dependencies (`Microsoft.Extensions.*`, `Spectre.Console`, `Spectre.Console.Cli`) already ship `net8.0` assets. The produced `.nupkg` carries both `lib/net8.0/` and `lib/net10.0/` folders.
+
+---
+
 ## [0.1.10] — 2026-06-10
 
 ### Changed

Directory.Build.props

@@ -1,6 +1,5 @@
 <Project>
   <PropertyGroup>
-    <TargetFramework>net10.0</TargetFramework>
     <Nullable>enable</Nullable>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <Authors>Stuart Meeks</Authors>

src/NextIteration.SpectreConsole.SelfUpdate/NextIteration.SpectreConsole.SelfUpdate.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFramework>net10.0</TargetFramework>
+		<TargetFrameworks>net8.0;net10.0</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 		<SatelliteResourceLanguages>en</SatelliteResourceLanguages>
@@ -11,7 +11,7 @@
 
 	<PropertyGroup>
 		<PackageId>NextIteration.SpectreConsole.SelfUpdate</PackageId>
-		<Version>0.1.10</Version>
+		<Version>0.2.0</Version>
 		<Authors>Stuart Meeks</Authors>
 		<Description>Self-update for Spectre.Console CLIs: pluggable update sources (GitHub Releases over HTTP, GitHub Releases via gh CLI for private repos, generic HTTPS manifest, custom), SHA-256 verification, atomic file swap, and a drop-in `update` command.</Description>
 		<GeneratePackageOnBuild Condition="'$(Configuration)' == 'Release'">true</GeneratePackageOnBuild>