Correct tyyypo

test/Microsoft.Extensions.Configuration.Test/Microsoft.Extensions.Configuration.Test.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk" ToolsVersion="15.0">
   <Import Project="..\..\build\common.props" />
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp1.1;net452/TargetFrameworks>
+    <TargetFrameworks>netcoreapp1.1;net452</TargetFrameworks>
     <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netcoreapp1.1</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup>