Fix build break

Author: AArnott

src/NerdBank.GitVersioning.Tests/NerdBank.GitVersioning.Tests.csproj

@@ -9,7 +9,7 @@
     <IsTestProject>true</IsTestProject>
   </PropertyGroup>
   <ItemGroup>
-    <Compile Include="..\Nerdbank.GitVersioning\SemanticVersionExtensions.cs" />
+    <Compile Include="..\Shared\**\*.cs" LinkBase="Shared" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="..\Nerdbank.GitVersioning.Tasks\build\Nerdbank.GitVersioning.targets">