Update to GNOME 3.34

build-aux/uk.me.bcowan.Rugby.json

 {
     "app-id" : "uk.me.bcowan.Rugby",
     "runtime" : "org.gnome.Platform",
-    "runtime-version" : "3.32",
+    "runtime-version" : "3.34",
     "sdk" : "org.gnome.Sdk",
     "command" : "rugby",
     "finish-args" : [

build-aux/uk.me.bcowan.Rugby.json.license

+SPDX-FileCopyrightText: 2018 Bruce Cowan <bruce@bcowan.me.uk>
+
+SPDX-License-Identifier: CC0-1.0