ggstats 0.8.0

Breaking changes

• geom_diverging(), geom_likert(), geom_pyramid(),
  geom_diverging_text(), geom_likert_text(), and geom_pyramid_text() have
  been redesigned (#73)
• stat_prop(): arguments height, labels and labeller have been
  removed (#73)

Improvements

• new geoms geom_connector(), geom_bar_connector() and
  geom_prop_connector() (#81)
• new shortcut auto_contrast (#75)