[calls] metainfo: Update developers

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit f1878383adf12f76720423b36a97df7551fb3c44
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Fri Jul 16 19:14:45 2021 +0200

    metainfo: Update developers

 data/org.gnome.Calls.metainfo.xml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/data/org.gnome.Calls.metainfo.xml b/data/org.gnome.Calls.metainfo.xml
index 7d33ae0b..231b9534 100644
--- a/data/org.gnome.Calls.metainfo.xml
+++ b/data/org.gnome.Calls.metainfo.xml
@@ -15,6 +15,8 @@
     
     <project_group>GNOME</project_group>
     <developer_name>Bob Ham</developer_name>
+    <developer_name>Evangelos Ribeiro Tzaras</developer_name>
+    <developer_name>Julian Sparber</developer_name>
 
     <recommends>
         <control>pointing</control>