Add NamedArgumentTypeAttribute

src/Discord.Net.Commands/Attributes/NamedArgumentTypeAttribute.cs

@@ -0,0 +1,7 @@
+using System;
+
+namespace Discord.Commands
+{
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = true)]
+    public sealed class NamedArgumentTypeAttribute : Attribute { }
+}

src/Discord.Net.Commands/Attributes/OverrideTypeReaderAttribute.cs

@@ -1,11 +1,10 @@
 using System;
-
 using System.Reflection;
 
 namespace Discord.Commands
 {
-    [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false, Inherited = true)]
-    public class OverrideTypeReaderAttribute : Attribute
+    [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
+    public sealed class OverrideTypeReaderAttribute : Attribute
     {
         private static readonly TypeInfo _typeReaderTypeInfo = typeof(TypeReader).GetTypeInfo();