Fix namespace

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

@@ -1,7 +1,7 @@
 using System;
 using System.Threading.Tasks;
 
-namespace Discord.Commands.Attributes
+namespace Discord.Commands
 {
     [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = true, Inherited = true)]
     public abstract class ParameterPreconditionAttribute : Attribute

src/Discord.Net.Commands/CommandParameter.cs

@@ -4,7 +4,6 @@ using System.Collections.Immutable;
 using System.Diagnostics;
 using System.Reflection;
 using System.Threading.Tasks;
-using Discord.Commands.Attributes;
 
 namespace Discord.Commands
 {