Disable runtime serialization for .net standard 2.0

.NET Standard 2.0 does no support RuntimeType serialization, so this feature is not available in .net core.
In addition, this feature is not very important because runtime serialization (binary formatter) is legacy for .net core.

Author: yfakariya

src/MsgPack/MessagePackObject.Utilities.cs

@@ -44,9 +44,9 @@
 
 namespace MsgPack
 {
-#if !SILVERLIGHT && !NETSTANDARD1_1 && !NETSTANDARD1_3
+#if !SILVERLIGHT && !NETSTANDARD1_1 && !NETSTANDARD1_3 && !NETSTANDARD2_0
 	[Serializable]
-#endif // !SILVERLIGHT && !NETSTANDARD1_1 && !NETSTANDARD1_3
+#endif // !SILVERLIGHT && !NETSTANDARD1_1 && !NETSTANDARD1_3 && !NETSTANDARD2_0
 	partial struct MessagePackObject : IPackable
 #if FEATURE_TAP
 		, IAsyncPackable

src/MsgPack/MessagePackString.cs

@@ -1,4 +1,4 @@
-#region -- License Terms --
+#region -- License Terms --
 //
 // MessagePack for CLI
 //
@@ -43,9 +43,9 @@ namespace MsgPack
 	/// <summary>
 	///		Encapselates <see cref="String"/> and its serialized UTF-8 bytes.
 	/// </summary>
-#if !SILVERLIGHT && !NETSTANDARD1_1 && !NETSTANDARD1_3
+#if !SILVERLIGHT && !NETSTANDARD1_1 && !NETSTANDARD1_3 && !NETSTANDARD2_0
 	[Serializable]
-#endif // !SILVERLIGHT && !NETSTANDARD1_1 && !NETSTANDARD1_3
+#endif // !SILVERLIGHT && !NETSTANDARD1_1 && !NETSTANDARD1_3 && !NETSTANDARD2_0
 #if !NET35 && !UNITY
 	[SecuritySafeCritical]
 #endif // !NET35 && !UNITY

test/MsgPack.UnitTest/MessagePackObjectDictionaryTest.cs

@@ -1,4 +1,4 @@
-#region -- License Terms --
+#region -- License Terms --
 //
 // MessagePack for CLI
 //
@@ -1337,7 +1337,7 @@ public void TestValuesCopyTo()
 			Assert.That( array[ 4 ], Is.EqualTo( MessagePackObject.Nil ) );
 		}
 
-#if !NETFX_CORE && !SILVERLIGHT && !UNITY && !NETSTANDARD1_1 && !NETSTANDARD1_3
+#if !NETFX_CORE && !SILVERLIGHT && !UNITY && !NETSTANDARD1_1 && !NETSTANDARD1_3 && !NETSTANDARD2_0
 		[Test]
 		public void TestRuntimeSerialization_NotEmpty_RoundTripped()
 		{
@@ -1351,7 +1351,7 @@ public void TestRuntimeSerialization_NotEmpty_RoundTripped()
 				Assert.AreEqual( target, deserialized );
 			}
 		}
-#endif // !NETFX_CORE && !SILVERLIGHT && !UNITY && !NETSTANDARD1_1 && !NETSTANDARD1_3
+#endif // !NETFX_CORE && !SILVERLIGHT && !UNITY && !NETSTANDARD1_1 && !NETSTANDARD1_3 && !NETSTANDARD2_0
 
 		private sealed class MyClass { }
 	}

test/MsgPack.UnitTest/MsgPack.UnitTest.csproj

@@ -769,6 +769,9 @@
       <LastGenOutput>UnpackerTest.cs</LastGenOutput>
     </None>
   </ItemGroup>
+  <ItemGroup>
+    <Compile Remove="MessagePackObjectTest.RuntimeSerialization.cs" Condition="'$(TargetFramework)' == 'netcoreapp1.0' or '$(TargetFramework)' == 'netcoreapp2.0'" />
+  </ItemGroup>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">