add SO tag to README.md, update package counts

Author: eddelbuettel

ChangeLog

@@ -1,3 +1,8 @@
+2019-09-28  Dirk Eddelbuettel  <edd@debian.org>
+
+	* README.md: Add a stackoverflow tag to indicate where to ask questions,
+	also updated package counts on CRAN and BioC for Rcpp users
+
 2019-08-06  Riccardo Porreca  <riccardo.porreca@mirai-solutions.com>
 
 	* vignettes/Rcpp-modules.Rmd: Extensive review and edit improving the

README.md

@@ -1,6 +1,6 @@
 ## Rcpp: Seamless R and C++ Integration
 
-[![Build Status](https://travis-ci.org/RcppCore/Rcpp.svg)](https://travis-ci.org/RcppCore/Rcpp) [![License](https://eddelbuettel.github.io/badges/GPL2+.svg)](http://www.gnu.org/licenses/gpl-2.0.html) [![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) [![Downloads](http://cranlogs.r-pkg.org/badges/Rcpp?color=brightgreen)](http://www.r-pkg.org/pkg/Rcpp) [![Coverage Status](https://codecov.io/gh/RcppCore/Rcpp/graph/badge.svg)](https://codecov.io/github/RcppCore/Rcpp?branch=master)
+[![Build Status](https://travis-ci.org/RcppCore/Rcpp.svg)](https://travis-ci.org/RcppCore/Rcpp) [![License](https://eddelbuettel.github.io/badges/GPL2+.svg)](http://www.gnu.org/licenses/gpl-2.0.html) [![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) [![Downloads](http://cranlogs.r-pkg.org/badges/Rcpp?color=brightgreen)](http://www.r-pkg.org/pkg/Rcpp) [![Coverage Status](https://codecov.io/gh/RcppCore/Rcpp/graph/badge.svg)](https://codecov.io/github/RcppCore/Rcpp?branch=master) [![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)
 
@@ -86,9 +86,9 @@ 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 November 2018,
-there are 1490 [CRAN](https://cran.r-project.org) packages using Rcpp, a further
-150 [BioConductor](http://www.bioconductor.org) packages in its current release
+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
 as well as an unknown number of GitHub, Bitbucket, R-Forge, ... repositories
 using Rcpp.  All these packages provide usage examples for Rcpp.