Replace GitHub release badge with CRAN badge

Author: alice-hannah

README.Rmd

@@ -27,9 +27,8 @@ ex2_alt <- paste("A bar chart with white background,",
 # sgplot <img src="man/figures/logo.svg" alt="sgplot logo" align="right" height="150"/>
 
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-[![GitHub release (latest by date)](https://img.shields.io/github/v/release/ScotGovAnalysis/sgplot)](https://github.com/ScotGovAnalysis/sgplot/releases/latest) [![R build status](https://github.com/ScotGovAnalysis/sgplot/workflows/R-CMD-check/badge.svg)](https://github.com/ScotGovAnalysis/sgplot/actions)
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+[![CRAN status](https://www.r-pkg.org/badges/version/sgplot)](https://CRAN.R-project.org/package=sgplot) 
+[![R build status](https://github.com/ScotGovAnalysis/sgplot/workflows/R-CMD-check/badge.svg)](https://github.com/ScotGovAnalysis/sgplot/actions/workflows/R-CMD-check.yaml)
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 sgplot is an R package for creating accessible plots in the Scottish Government. Currently, functions are available for styling ggplot2 plots.