Replaced the TargetFrameworkVersion.

Author: tillig

src/Autofac.Extras.Attributed/Autofac.Extras.Attributed.csproj

@@ -12,6 +12,7 @@
     <AssemblyName>Autofac.Extras.Attributed</AssemblyName>
     <FileAlignment>512</FileAlignment>
     <SignAssembly>true</SignAssembly>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <AssemblyOriginatorKeyFile>..\..\Autofac.snk</AssemblyOriginatorKeyFile>
     <CodeAnalysisAdditionalOptions>/assemblyCompareMode:StrongNameIgnoringVersion</CodeAnalysisAdditionalOptions>
   </PropertyGroup>
@@ -80,4 +81,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>