Add back missing SourceLink

It was lost in a bad merge conflict handling.

Fixes:
commit b958303
Author: Tristan Milnthorp <[email protected]>
Date:   Tue Nov 6 11:12:52 2018 -0500

    Sign all packages and remove .Signed packages (#539)

Author: angularsen

UnitsNet.Serialization.JsonNet/UnitsNet.Serialization.JsonNet.csproj

@@ -25,6 +25,13 @@
     <TargetFrameworks>netstandard2.0;net40</TargetFrameworks>
   </PropertyGroup>
 
+  <!-- SourceLink -->
+  <PropertyGroup>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <EmbedUntrackedSources>true</EmbedUntrackedSources>
+    <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
+  </PropertyGroup>
+
   <!-- Strong name signing -->
   <PropertyGroup>
     <AssemblyOriginatorKeyFile>../UnitsNet.snk</AssemblyOriginatorKeyFile>
@@ -35,6 +42,7 @@
   <!-- NuGet references that work for both signed and unsigned -->
   <ItemGroup>
     <PackageReference Include="JetBrains.Annotations" Version="10.4.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta-63127-02" PrivateAssets="All"/>
     <PackageReference Include="Newtonsoft.Json" Version="9.0.1" />
   </ItemGroup>
 

UnitsNet/UnitsNet.csproj

@@ -25,6 +25,13 @@
     <TargetFrameworks>netstandard2.0;net40</TargetFrameworks>
   </PropertyGroup>
 
+  <!-- SourceLink -->
+  <PropertyGroup>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <EmbedUntrackedSources>true</EmbedUntrackedSources>
+    <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
+  </PropertyGroup>
+
   <!-- Strong name signing -->
   <PropertyGroup>
     <AssemblyOriginatorKeyFile>../UnitsNet.snk</AssemblyOriginatorKeyFile>
@@ -35,6 +42,7 @@
   <!-- NuGet references that work for both signed and unsigned -->
   <ItemGroup>
     <PackageReference Include="JetBrains.Annotations" Version="10.4.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta-63127-02" PrivateAssets="All"/>
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>