Bump lyon, font-kit and skribo versions to fix crashes

[SethDusek]

Hi. This bumps font-kit, lyon, and skribo versions to fix a crash in the canvas_text program which was a result of a bug in font-kit which seemed to have been fixed in this commit, yet since pathfinder and its dependencies were using an older version of font-kit, it did not receive this fix. As a result, canvas_text would crash with the following:

thread 'main' panicked at 'assertion failed: *current_point_index <= last_point_index_in_contour', /home/kamal/.cargo/registry/src/github.com-1ecc6299db9ec823/font-kit-0.2.0/src/loaders/freetype.rs:576:13

This patch bumps font-kit versions in pathfinder's dependencies and fixes the breaking changes that come with it. I've also submitted a PR to skribo for it to use font-kit 0.4, and that has been merged.

edit: I should probably mention this fixes #231