v0.8.0

• Generate bindings against latest SFCGAL version 2.0.0.

• Update bindgen version to `0.70

v0.7.0

• Generate bindings against latest SFCGAL version 1.5.0.
• Update bindgen version to 0.69.

v0.6.0

• Generate bindings with size_t_is_usize option.

v0.5.0

• Update bindgen version to 0.64.
• Generate bindings against latest SFCGAL version 1.4.1.
• Switch from travis to github actions.