New release with updated dependencies

Can you make a new release with updated dependence?

gtk-rs 0.5.0 depends on gio 0.16, while tracker-rs depends on gio 0.15.1.

error[E0277]: the trait bound `std::option::Option<&Cancellable>: glib::object::IsA<gio::auto::cancellable::Cancellable>` is not satisfied
   --> src/main.rs:25:36
    |
55  |     let cursor = bus.query(sparql, Some(&cancellable));
    |                      -----         ^^^^^^^^^^^^^^^^^^ the trait `glib::object::IsA<gio::auto::cancellable::Cancellable>` is not implemented for `std::option::Option<&Cancellable>`
    |                      |