Log Message:
(graphics/R-viridis) Updated 0.6.1.to 0.6.5

# viridis 0.6.5
## New features

* N/A.

## Minor improvements and fixes

* Fix a problem with ggplot next release (thanks to @teunbrand).

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# viridis 0.6.4
## New features

* N/A.

## Minor improvements and fixes

* Fix a problem with checking R version in R-devel.

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# viridis 0.6.3
## New features

* N/A.

## Minor improvements and fixes

* Fix scale functions when aesthetics are specified
  (thanks to Alan O'Callaghan, https://github.com/Alanocallaghan)

* Remove deprecated dependencies.
* Fix CITATION issues.
* Fix check issues.

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# viridis 0.6.2
## New features

* N/A.

## Minor improvements and fixes

* Fix minor check warnings requested by CRAN.