Flatpak: update runtime version

flatpak/README.md

@@ -4,8 +4,8 @@
 --------------------------
 
 1. `flatpak --user remote-add --from gnome https://sdk.gnome.org/gnome.flatpakrepo`
-1. `flatpak --user install gnome org.gnome.Platform//3.26`
-1. `flatpak --user install gnome org.gnome.Sdk//3.26`
+1. `flatpak --user install gnome org.gnome.Platform//3.28`
+1. `flatpak --user install gnome org.gnome.Sdk//3.28`
 1. `flatpak-builder --repo=repo directory gajim/org.gajim.Gajim.json`
 1. `flatpak --user remote-add --no-gpg-verify repo repo`
 1. `flatpak --user install repo org.gajim.Gajim`

org.gajim.Gajim.json

 {
     "app-id": "org.gajim.Gajim",
     "runtime": "org.gnome.Platform",
-    "runtime-version": "3.26",
+    "runtime-version": "3.28",
     "sdk": "org.gnome.Sdk",
     "command": "gajim",
     "tags": ["nightly"],