FEATURE: allow version emails to be disabled globally

config/discourse_defaults.conf

@@ -99,4 +99,9 @@ serve_static_assets = false
 sidekiq_workers = 5
 
 # adjust stylesheets to rtl (requires "rtlit" gem)
-rtl_css = false
+rtl_css = false
+
+# notify admin when a new version of discourse is released
+# this is global so it is easier to set in multisites
+# TODO allow for global overrides
+new_version_emails = true