gghourglass v0.0.3
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 * Fixed test to pass on all systems
 * Fixed compatibility with latest `ggplot2` release

gghourglass v0.0.2
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  * Added `annotate_periodstates()`, `uses_dst()`
    `lunar_phase_polygon()` and `annotate_lunarphase()`
  * Updated documentation
  * Added vignettes
  * Improved test coverage
  * Some small tweaks

gghourglass v0.0.1
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  * Initial release which can:
    * Split dates and time of day from datetime objects
    * Add the date and time of day components to a ggplot as layer
    * Add sunlight annotations to the plot
