add note about 'no longer in development'

gregsdennis · gregsdennis · commit 69c9f28c9c9b · 2021-02-22T21:06:57.000+13:00
diff --git a/implementations.md b/implementations.md
@@ -6,7 +6,7 @@ permalink: /implementations.html
 
 _**NOTE:** This page lists implementations with (or actively working towards) support for draft-06 or later._
 
-_For implementations supporting only draft-04 or older, see the [Obsolete Implementations](obsolete-implementations) page._
+_For implementations supporting only draft-04 or older, or that are no longer in development, see the [Obsolete Implementations](obsolete-implementations) page._
 
 
 * TOC
