Merge commit 'b78f6541dc5d8a32c3129960b3344dcedb8e5735' as 'NHotkey'

NHotkey/NHotkey.WindowsForms/ExtensionAttribute.cs

@@ -0,0 +1,10 @@
+// ReSharper disable once CheckNamespace
+namespace System.Runtime.CompilerServices
+{
+    // Enables extension methods in assembly that targets .NET 2.0
+
+    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Method)]
+    internal sealed class ExtensionAttribute : Attribute
+    {
+    }
+}