fixed the broken build

Author: niemyjski

Source/Tests/Exceptionless.Tests.csproj

@@ -51,7 +51,7 @@
       <Private>True</Private>
     </Reference>
     <Reference Include="Microsoft.Build" />
-    <Reference Include="Microsoft.Build.Framework, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
+    <Reference Include="Microsoft.Build.Framework" />
     <Reference Include="Microsoft.Build.Utilities.v12.0, Version=12.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
     <Reference Include="Microsoft.Build.Utilities.v4.0" />
     <Reference Include="Microsoft.CSharp" />