Version 2.43.2
- All the filter effects have been ported to Rust as part of Ivan
  Molodetskikh's Summer of Code project!!!!!
- We now require Rust 1.26.
- We now include Rust debug information even in release builds, to make it
  easier to obtain stack traces.
- Fix #310 - Respect DPI in the font-size property (Mike Marcacci).
- Fix: draw the circle/ellipse elements with the same orientation as
  the SVG 1.1 test suite; this is relevant for stroke-dasharray (Ivan
  Molodetskikh).
- Refactoring of the drawing code and font sizes (Paolo Borelli).
- New filters in Rust: feConvolveMatrix, feColorMatrix, feMorphology,
  feDisplacementMap, feGaussianBlur, feDistantLight, feSpotLight,
  fePointLight, feTile.
- Updated Rust dependencies (Igor Gnatenko).