Log Message:
(graphics/R-ggthemes) Updated 4.2.4 to 5.1.0

# ggthemes 5.1.0

- Updated `scale_color_gdocs` and `gdocs_pal` to use current
  colors. Palette extended from 10 to 24 colors.
- Updated tests to be compatible with ggplot 3.5.0 (#153)
- Removed `legend.title.align` and `legend.text.align` from
  themes. (#153)

# ggthemes 5.0.0

- Deprecate `circlefill_shape_pal` and `scale_shape_circlefill`
- Bugfix: Fix failing CRAN tests. Shape scales and palettes could fail
  if glyphs unavailable in graphics devices.
- Bugfix: Add alias to `ggthemes-package`
- Add `quantreg` to suggested packages