Update README.md with more https URLs (#24)

README.md

@@ -3,10 +3,10 @@
 [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/github/jlmelville/rcpphnsw?branch=master&svg=true)](https://ci.appveyor.com/project/jlmelville/rcpphnsw)
 [![R-CMD-check](https://github.com/jlmelville/rcpphnsw/workflows/R-CMD-check/badge.svg)](https://github.com/jlmelville/rcpphnsw/actions)
 [![Coverage Status](https://img.shields.io/codecov/c/github/jlmelville/rcpphnsw/master.svg)](https://codecov.io/github/jlmelville/rcpphnsw?branch=master)
-[![CRAN Status Badge](http://www.r-pkg.org/badges/version/RcppHNSW)](https://cran.r-project.org/package=RcppHNSW)
+[![CRAN Status Badge](https://www.r-pkg.org/badges/version/RcppHNSW)](https://cran.r-project.org/package=RcppHNSW)
 [![Dependencies](https://tinyverse.netlify.app/badge/RcppHNSW)](https://cran.r-project.org/package=RcppHNSW)
 [![CRAN Monthly Downloads](https://cranlogs.r-pkg.org/badges/RcppHNSW)](https://cran.r-project.org/package=RcppHNSW)
-![CRAN Downloads](http://cranlogs.r-pkg.org/badges/grand-total/RcppHNSW)
+![CRAN Downloads](https://cranlogs.r-pkg.org/badges/grand-total/RcppHNSW)
 [![Last Commit](https://img.shields.io/github/last-commit/jlmelville/rcpphnsw)](https://github.com/jlmelville/rcpphnsw)
 
 Rcpp bindings for [hnswlib](https://github.com/nmslib/hnswlib).