Make attributes public

Author: GeorchW

src/Attributes.cs

@@ -1,15 +1,15 @@
 namespace SimpleECS
 {
     [System.AttributeUsage(System.AttributeTargets.Parameter, Inherited = false, AllowMultiple = false)]
-    sealed class BannedAttribute : System.Attribute
+    public sealed class BannedAttribute : System.Attribute
     {
     }
     [System.AttributeUsage(System.AttributeTargets.Parameter, Inherited = false, AllowMultiple = false)]
-    sealed class GlobalAttribute : System.Attribute
+    public sealed class GlobalAttribute : System.Attribute
     {
     }
     [System.AttributeUsage(System.AttributeTargets.Parameter, Inherited = false, AllowMultiple = false)]
-    sealed class ChangedAttribute : System.Attribute
+    public sealed class ChangedAttribute : System.Attribute
     {
     }
 }