[gnome-builder] add missing appdata

[Christian Hergert <chergert src gnome org>]

commit fbc80955b924929c9272a92f6a295cc4274242c5
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jun 18 21:45:09 2018 -0700

    add missing appdata

 data/org.gnome.Builder.appdata.xml.in | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/data/org.gnome.Builder.appdata.xml.in b/data/org.gnome.Builder.appdata.xml.in
index 25c95f5fc..908776319 100644
--- a/data/org.gnome.Builder.appdata.xml.in
+++ b/data/org.gnome.Builder.appdata.xml.in
@@ -81,6 +81,15 @@
   <translation type="gettext">gnome-builder</translation>
 
   <releases>
+    <release version="3.29.3" date="2018-06-18">
+      <description>
+        <p>
+          This release includes a brand new auto-completion engine which allows for considerably less 
overhead.
+          A number of critical bug fixes are included as well.
+        </p>
+      </description>
+    </release>
+
     <release version="3.29.1" date="2018-04-16">
       <description>
         <p>