[release-notes] Add glade

[Link Dupont <link src gnome org>]

commit 31c34dbe82d4c2c0691cebdf00a3ff333b4ded35
Author: Link Dupont <link sub-pop net>
Date:   Tue Sep 8 10:55:15 2020 -0400

    Add glade

 help/C/developers.page | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/help/C/developers.page b/help/C/developers.page
index 99f2f0fb..a9388c59 100644
--- a/help/C/developers.page
+++ b/help/C/developers.page
@@ -94,6 +94,9 @@
       instead of <cmd>rls</cmd>.</p></item>
       <item><p>Support for tracing with sysprof has been integrated in GLib,
       libsoup and pango.</p></item>
+      <item><p>Glade now supports GJS widgets, automatic loading of composition
+      templates, and improved deprecation checks using version data from
+      introspection.</p></item>
     </list>
   </section>