Build v1.1 branch in flatpak manifest

Author: ranfdev

build-aux/com.ranfdev.Geopard.json

@@ -35,7 +35,7 @@
                 {
                     "type" : "git",
                     "url" : "../",
-                    "branch": "master"
+                    "branch": "v1.1"
                 }
             ]
         }