Update README badge

- now shows 'downloads' per month over total downloads
- closes #109

README.Rmd

@@ -30,7 +30,7 @@ ver <- paste0("https://img.shields.io/badge/Version-", desc$Version,
 <!-- badges: start -->
 ![GitHub version](`r ver`)
 [![CRAN status](http://www.r-pkg.org/badges/version/SomaDataIO)](https://cran.r-project.org/package=SomaDataIO)
-[![](https://cranlogs.r-pkg.org/badges/grand-total/SomaDataIO)](https://cran.r-project.org/package=SomaDataIO)
+[![Downloads](https://cranlogs.r-pkg.org/badges/SomaDataIO)](https://cran.r-project.org/package=SomaDataIO)
 [![R-CMD-check](https://github.com/SomaLogic/SomaDataIO/workflows/R-CMD-check/badge.svg)](https://github.com/SomaLogic/SomaDataIO/actions)
 [![Codecov test coverage](https://codecov.io/gh/SomaLogic/SomaDataIO/branch/main/graph/badge.svg)](https://app.codecov.io/gh/SomaLogic/SomaDataIO?branch=main)
 [![Lifecycle: stable](https://img.shields.io/badge/lifecycle-stable-brightgreen.svg)](https://lifecycle.r-lib.org/articles/stages.html#stable)

README.md

@@ -9,7 +9,7 @@
 version](https://img.shields.io/badge/Version-6.1.0.9000-success.svg?style=flat&logo=github)
 [![CRAN
 status](http://www.r-pkg.org/badges/version/SomaDataIO)](https://cran.r-project.org/package=SomaDataIO)
-[![](https://cranlogs.r-pkg.org/badges/grand-total/SomaDataIO)](https://cran.r-project.org/package=SomaDataIO)
+[![Downloads](https://cranlogs.r-pkg.org/badges/SomaDataIO)](https://cran.r-project.org/package=SomaDataIO)
 [![R-CMD-check](https://github.com/SomaLogic/SomaDataIO/workflows/R-CMD-check/badge.svg)](https://github.com/SomaLogic/SomaDataIO/actions)
 [![Codecov test
 coverage](https://codecov.io/gh/SomaLogic/SomaDataIO/branch/main/graph/badge.svg)](https://app.codecov.io/gh/SomaLogic/SomaDataIO?branch=main)