[gtk] Update our appdata files

[Matthias Clasen <matthiasc src gnome org>]

commit ad3514216d7d499b436d4c4fd98530c6f43d4e0e
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jul 29 17:58:45 2020 -0400

    Update our appdata files
    
    Mention the new release in all our appdata files.

 demos/gtk-demo/org.gtk.Demo4.appdata.xml                | 5 +++++
 demos/icon-browser/org.gtk.IconBrowser4.appdata.xml     | 5 +++++
 demos/print-editor/org.gtk.PrintEditor4.appdata.xml     | 2 +-
 demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml | 5 +++++
 4 files changed, 16 insertions(+), 1 deletion(-)
---
diff --git a/demos/gtk-demo/org.gtk.Demo4.appdata.xml b/demos/gtk-demo/org.gtk.Demo4.appdata.xml
index 5aa974bfb8..f102eb7eaa 100644
--- a/demos/gtk-demo/org.gtk.Demo4.appdata.xml
+++ b/demos/gtk-demo/org.gtk.Demo4.appdata.xml
@@ -31,6 +31,11 @@
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
   <releases>
+    <release version="3.99.0" date="2020-07-30">
+      <description>
+        <p>A new developers snapshot towards GTK 4.0.</p>
+      </description>
+    </release>
     <release version="3.94.0" date="2018-06-25">
       <description>
         <p>A new developers snapshot towards GTK 4.0.</p>
diff --git a/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml 
b/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml
index 838449ac27..33a3a88d49 100644
--- a/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml
+++ b/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml
@@ -22,6 +22,11 @@
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
   <releases>
+    <release version="3.99.0" date="2020-07-30">
+      <description>
+        <p>A new developers snapshot towards GTK 4.0.</p>
+      </description>
+    </release>
     <release version="3.94.0" date="2018-06-25">
       <description>
         <p>A new developers snapshot towards GTK 4.0.</p>
diff --git a/demos/print-editor/org.gtk.PrintEditor4.appdata.xml 
b/demos/print-editor/org.gtk.PrintEditor4.appdata.xml
index 2d60e80666..e0eb6a0727 100644
--- a/demos/print-editor/org.gtk.PrintEditor4.appdata.xml
+++ b/demos/print-editor/org.gtk.PrintEditor4.appdata.xml
@@ -25,7 +25,7 @@
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
   <releases>
-    <release version="3.99.0" date="2020">
+    <release version="3.99.0" date="2020-07-30">
       <description>
         <p>A new developers snapshot towards GTK 4.0.</p>
       </description>
diff --git a/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml 
b/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml
index 0f088394c0..b3e9889137 100644
--- a/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml
+++ b/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml
@@ -32,6 +32,11 @@
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
   <releases>
+    <release version="3.99.0" date="2020-07-30">
+      <description>
+        <p>A new developers snapshot towards GTK 4.0.</p>
+      </description>
+    </release>
     <release version="3.94.0" date="2018-06-25">
       <description>
         <p>A new developers snapshot towards GTK 4.0.</p>