Version 2.45.5
- At build time, you can now pass $CARGO and $RUSTC environment
  variables if you need to override the default Rust toolchain.
  Please see COMPILING.md for details.  (Tobias Kortkamp)
- Fix #405 - In the gdk-pixbuf loader, don't crash if the write()
  function doesn't receive a GError.
- Fix #268 - Remove the comp-op property; it's not in SVG 1.1 nor SVG 2.
- Fix #415 - register RsvgHandleFlags and the RsvgError enum values in
  a thread-safe fashion (Sebastian Dröge).
- All of the library's non-GObject functionality is implemented in
  Rust now.
- Update the cairo crate (Kornel Lesiński).
- Clean up the loading code paths (Paolo Borelli).
- Updated compilation docs for Debian (Jordan Petridis)
- Updated parts of the reference documentation.