[yelp] Fix wrong attribute in appdata file

[Shaun McCance <shaunm src gnome org>]

commit 9df5bcf4e9ecb32218eebe92f9e00b33db9aad42
Author: Shaun McCance <shaunm gnome org>
Date:   Sat Sep 25 10:58:46 2021 -0400

    Fix wrong attribute in appdata file
    
    (again) fixes https://gitlab.gnome.org/GNOME/yelp/-/issues/184

 data/yelp.appdata.xml.in | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/data/yelp.appdata.xml.in b/data/yelp.appdata.xml.in
index 7f069732..780e7006 100644
--- a/data/yelp.appdata.xml.in
+++ b/data/yelp.appdata.xml.in
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
   <releases>
-    <release version="41.0" timestamp="2021-09-18">
+    <release version="41.0" date="2021-09-18">
       <description>
         <p>Help 41.0 contains the following improvements:</p>
         <ul>
@@ -12,7 +12,7 @@
         </ul>
       </description>
     </release>
-    <release version="40" timestamp="2020-03-20"/>
+    <release version="40" date="2020-03-20"/>
   </releases>
   <id>yelp.desktop</id>
   <metadata_license>CC0-1.0</metadata_license>