add 'last commit' badge, update usage numbers

Author: eddelbuettel

README.md

@@ -5,12 +5,13 @@
 [![CRAN](http://www.r-pkg.org/badges/version/Rcpp)](https://cran.r-project.org/package=Rcpp)
 [![Dependencies](https://tinyverse.netlify.com/badge/Rcpp)](https://cran.r-project.org/package=Rcpp)
 [![Coverage Status](https://codecov.io/gh/RcppCore/Rcpp/graph/badge.svg)](https://codecov.io/github/RcppCore/Rcpp?branch=master)
-[![Debian package](https://img.shields.io/debian/v/r-cran-rcpp/sid?color=brightgreen)](https://packages.debian.org/sid/r-cran-rcpp)  
+[![Debian package](https://img.shields.io/debian/v/r-cran-rcpp/sid?color=brightgreen)](https://packages.debian.org/sid/r-cran-rcpp)
+[![Last Commit](https://img.shields.io/github/last-commit/RcppCore/Rcpp)](https://github.com/RcppCore/Rcpp)
 [![Downloads](http://cranlogs.r-pkg.org/badges/Rcpp?color=brightgreen)](http://www.r-pkg.org/pkg/Rcpp)
 [![CRAN use](https://jangorecki.gitlab.io/rdeps/Rcpp/CRAN_usage.svg?sanitize=true)](https://cran.r-project.org/package=Rcpp)
 [![CRAN indirect](https://jangorecki.gitlab.io/rdeps/Rcpp/indirect_usage.svg?sanitize=true)](https://cran.r-project.org/package=Rcpp)
 [![BioConductor use](https://jangorecki.gitlab.io/rdeps/Rcpp/BioC_usage.svg?sanitize=true)](https://cran.r-project.org/package=Rcpp)
-[![StackOverflow](https://img.shields.io/badge/stackoverflow-rcpp-orange.svg)](https://stackoverflow.com/questions/tagged/rcpp)  
+[![StackOverflow](https://img.shields.io/badge/stackoverflow-rcpp-orange.svg)](https://stackoverflow.com/questions/tagged/rcpp)
 [![JSS](https://img.shields.io/badge/JSS-10.18637%2Fjss.v040.i08-brightgreen)](http://dx.doi.org/10.18637/jss.v040.i08)
 [![Springer useR!](https://img.shields.io/badge/Springer%20useR!-10.1007%2F978--1--4614--6868--4-brightgreen)](https://www.springer.com/gp/book/9781461468677)
 [![TAS](https://img.shields.io/badge/TAS-10.1080%2F00031305.2017.1375990-brightgreen)](http://dx.doi.org/10.1080/00031305.2017.1375990)
@@ -88,18 +89,18 @@ documented and working examples. The
 [package RcppExamples](https://cran.r-project.org/package=RcppExamples) contains a few basic
 examples covering the core data types.
 
-A number of examples are included as are 1437 unit tests in 622 unit
-test functions provide additional usage examples.
+A number of examples are included, as are 1560 unit tests which provide
+additional usage examples.
 
 An earlier version of Rcpp, containing what we now call the 'classic Rcpp
 API' was written during 2005 and 2006 by Dominick Samperi.  This code has
 been factored out of Rcpp into the package RcppClassic, and it is still
 available for code relying on the older interface. New development should
 always use this Rcpp package instead.
 
-Other usage examples are provided by packages using Rcpp. As of September 2019,
-there are 1790 [CRAN](https://cran.r-project.org) packages using Rcpp, a further
-176 [BioConductor](http://www.bioconductor.org) packages in its current release
+Other usage examples are provided by packages using Rcpp. As of March 2020,
+there are 1900 [CRAN](https://cran.r-project.org) packages using Rcpp, a further
+191 [BioConductor](http://www.bioconductor.org) packages in its current release
 as well as an unknown number of GitHub, Bitbucket, R-Forge, ... repositories
 using Rcpp.  All these packages provide usage examples for Rcpp.