Use https in CRAN URLs

Author: lionel-

README.Rmd

@@ -16,7 +16,7 @@ knitr::opts_chunk$set(
 
 # purrr <img src="man/figures/logo.png" align="right" />
 
-[![CRAN_Status_Badge](https://www.r-pkg.org/badges/version/purrr)](http://cran.r-project.org/package=purrr)
+[![CRAN_Status_Badge](https://www.r-pkg.org/badges/version/purrr)](https://cran.r-project.org/package=purrr)
 [![Build Status](https://travis-ci.org/tidyverse/purrr.svg?branch=master)](https://travis-ci.org/tidyverse/purrr)
 [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/github/tidyverse/purrr?branch=master&svg=true)](https://ci.appveyor.com/project/tidyverse/purrr)
 [![Coverage Status](https://img.shields.io/codecov/c/github/tidyverse/purrr/master.svg)](https://codecov.io/github/tidyverse/purrr?branch=master)

README.md

@@ -3,7 +3,7 @@
 
 # purrr <img src="man/figures/logo.png" align="right" />
 
-[![CRAN\_Status\_Badge](https://www.r-pkg.org/badges/version/purrr)](http://cran.r-project.org/package=purrr)
+[![CRAN\_Status\_Badge](https://www.r-pkg.org/badges/version/purrr)](https://cran.r-project.org/package=purrr)
 [![Build
 Status](https://travis-ci.org/tidyverse/purrr.svg?branch=master)](https://travis-ci.org/tidyverse/purrr)
 [![AppVeyor Build