[longomatch] Add missing reference to solution

[Andoni Morales Alastruey <amorales src gnome org>]

commit b6d30903defbbd7d8f5a20fc3f84df332cae29f5
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Fri Oct 3 19:49:01 2014 +0200

    Add missing reference to solution

 LongoMatch.Core/LongoMatch.Core.csproj |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/LongoMatch.Core/LongoMatch.Core.csproj b/LongoMatch.Core/LongoMatch.Core.csproj
index a9b5172..21a4379 100644
--- a/LongoMatch.Core/LongoMatch.Core.csproj
+++ b/LongoMatch.Core/LongoMatch.Core.csproj
@@ -150,6 +150,7 @@
     <Reference Include="Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=b9a188c8922137c6">
       <Package>newtonsoft-json</Package>
     </Reference>
+    <Reference Include="System.Runtime.Serialization" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
 </Project>
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