Fix csproj to support .NET Framework 4.6.0

Author: yfakariya

src/MsgPack/MsgPack.csproj

@@ -11,7 +11,7 @@
     <RootNamespace>MsgPack</RootNamespace>
     <AssemblyName>MsgPack</AssemblyName>
     <FileAlignment>512</FileAlignment>
-    <TargetFrameworks>net462;net35;net45;netstandard1.1;netstandard1.3;MonoAndroid10;Xamarin.iOS10</TargetFrameworks>
+    <TargetFrameworks>net46;net35;net45;netstandard1.1;netstandard1.3;MonoAndroid10;Xamarin.iOS10</TargetFrameworks>
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
@@ -46,7 +46,7 @@
   <PropertyGroup Condition="'$(TargetFramework)' != 'MonoAndroid10' and '$(TargetFramework)' != 'Xamarin.iOS10'">
     <DocumentationFile>$(OutputPath)\$(TargetFramework)\MsgPack.XML</DocumentationFile>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(TargetFramework)' == 'net45' or '$(TargetFramework)' == 'net462' or '$(TargetFramework)' == 'netstandard1.1' or '$(TargetFramework)' == 'netstandard1.3' or '$(TargetFramework)' == 'uap10.0' or '$(TargetFramework)' == 'MonoAndroid10' or '$(TargetFramework)' == 'Xamarin.iOS10'">
+  <PropertyGroup Condition="'$(TargetFramework)' == 'net45' or '$(TargetFramework)' == 'net46' or '$(TargetFramework)' == 'netstandard1.1' or '$(TargetFramework)' == 'netstandard1.3' or '$(TargetFramework)' == 'uap10.0' or '$(TargetFramework)' == 'MonoAndroid10' or '$(TargetFramework)' == 'Xamarin.iOS10'">
     <DefineConstants>$(DefineConstants);FEATURE_TAP;FEATURE_CONCURRENT</DefineConstants>
   </PropertyGroup>
   <PropertyGroup Condition="'$(TargetFramework)' == 'net35'">