Remove broken status badge from README

Author: jgabry

README.md

@@ -1,7 +1,6 @@
 # CmdStanR <img src="man/figures/logo.svg" align="right" width="120" />
 
 <!-- badges: start -->
-[![CRAN status](https://www.r-pkg.org/badges/version/cmdstanr)](https://CRAN.R-project.org/package=cmdstanr)
 [![Unit tests](https://github.com/stan-dev/cmdstanr/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/stan-dev/cmdstanr/actions/workflows/R-CMD-check.yaml)
 [![Codecov test coverage](https://codecov.io/gh/stan-dev/cmdstanr/branch/master/graph/badge.svg)](https://app.codecov.io/gh/stan-dev/cmdstanr?branch=master)
 <!-- badges: end -->