Remove net451 as a cross-compile target

.gitignore

@@ -35,4 +35,5 @@ nuget.exe
 *.sln.ide
 node_modules
 *launchSettings.json
-*.orig
+*.orig
+global.json

src/Microsoft.AspNetCore.JsonPatch/Microsoft.AspNetCore.JsonPatch.csproj

@@ -3,7 +3,7 @@
 
   <PropertyGroup>
     <Description>ASP.NET Core support for JSON PATCH.</Description>
-    <TargetFrameworks>net451;netstandard1.3</TargetFrameworks>
+    <TargetFramework>netstandard1.3</TargetFramework>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;json;jsonpatch</PackageTags>
@@ -11,11 +11,8 @@
 
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="$(JsonNetVersion)" />
-    <PackageReference Include="Microsoft.Extensions.ClosedGenericMatcher.Sources" Version="$(AspNetCoreVersion)" PrivateAssets="All" />
-  </ItemGroup>
-
-  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">
     <PackageReference Include="Microsoft.CSharp" Version="$(CoreFxVersion)" />
+    <PackageReference Include="Microsoft.Extensions.ClosedGenericMatcher.Sources" Version="$(AspNetCoreVersion)" PrivateAssets="All" />
     <PackageReference Include="System.Reflection.TypeExtensions" Version="$(CoreFxVersion)" />
   </ItemGroup>
 

test/Microsoft.AspNetCore.JsonPatch.Test/Microsoft.AspNetCore.JsonPatch.Test.csproj

@@ -3,7 +3,7 @@
   <Import Project="..\..\build\common.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.0;net452</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.0;net46</TargetFrameworks>
     <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netcoreapp2.0</TargetFrameworks>
   </PropertyGroup>