Bump SourceLink to 1.0.0

Author: qmfrederik

src/Directory.Build.props

@@ -25,7 +25,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" PrivateAssets="All" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-19367-01" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
   </ItemGroup>
 
   <Target Name="PrepareReleaseNotes" BeforeTargets="GenerateNuspec" DependsOnTargets="GetBuildVersion">