feat: upgrade to version 3

Author: lachhebo

data/com.github.lachhebo.Gabtag.appdata.xml.in

@@ -5,7 +5,7 @@
 	<metadata_license>CC0-1.0</metadata_license>
 	<project_license>GPL-3.0-or-later</project_license>
   <releases>
-    <release date="2022-01-23" version="2.1"/>
+    <release date="2022-01-23" version="3"/>
   </releases>
   <version>1.6.0</version>
   ​<categories>