2.28.0 (unstable):

Gio:
* DBus::Connection:
  - Added a register_method() overload with no vtable.
  - register_object(), register_subtree(): Take the VTable by reference,
  not pointer.
  (Murray Cumming)
* DBus::MethodInvocation:
  - get_parameters(): Return a VariantContainerBase instead of taking a
  VariantBase.
  - return_gerror(), return_error_literal(): Rename them both to return_error().
  (Murray Cumming)
* DBus::NodeInfo::lookup_interface(): Add a method overload with no name.
  (Murray Cumming)
* DBus::Proxy: Rename type_map_changed_properties to MapChangeProperties.
  (Murray Cumming)
* DBus::VariantContainerBase::create_tuple(): Add a method overload that takes
  a single VariantBase,
* Settings: Really add list_schemas().
  (Murray Cumming)