Update README.md

README.md

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 R Package: Basic functions implemented in C (and for some missing from base R)
 
 [![CRAN](https://www.r-pkg.org/badges/version-last-release/kit?color=blue)](https://cran.r-project.org/package=kit)
-[![CRAN](https://badges.cranchecks.info/flavor/devel/kit.svg)](https://cran.r-project.org/web/checks/check_results_kit.html)
+[![CRAN](https://badges.cranchecks.info/flavor/release/kit.svg)](https://cran.r-project.org/web/checks/check_results_kit.html)
 [![License: GPL v3](https://img.shields.io/github/license/2005m/kit)](https://www.gnu.org/licenses/gpl-3.0)
 [![R-CMD-check](https://github.com/2005m/kit/workflows/R-CMD-check/badge.svg)](https://github.com/2005m/kit/actions)
 [![AppVeyor build status](https://ci.appveyor.com/api/projects/status/github/2005m/kit?branch=master&svg=true)](https://ci.appveyor.com/project/2005m/kit/branch/master)