update gregsdennis offerings

_data/validator-libraries-modern.yml

@@ -8,14 +8,9 @@
       license: "AGPL-3.0-only"
     - name: JsonSchema.Net
       url: https://github.com/gregsdennis/json-everything
-      date-draft: [2019-09]
+      date-draft: [2020-12, 2019-09]
       draft: [7, 6]
       license: MIT
-    - name: Manatee.Json
-      url: https://github.com/gregsdennis/Manatee.Json
-      date-draft: [2019-09]
-      draft: [7, 6, 4]
-      license: MIT
 - name: C
   implementations:
     - name: WJElement

_data/validator-libraries-obsolete.yml

@@ -6,6 +6,11 @@
       notes:
       draft: [4]
       license: Ms-PL
+    - name: Manatee.Json
+      url: https://github.com/gregsdennis/Manatee.Json
+      date-draft: [2019-09]
+      draft: [7, 6, 4]
+      license: MIT
 - name: C++
   anchor-name: cpp
   implementations:

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