total downloads badge added

Added badge for total downloads in README

README.md

@@ -3,6 +3,7 @@
 <!-- badges: start -->
 
 [![Build status](https://ci.appveyor.com/api/projects/status/3mp1p26lpqp16t3d?svg=true)](https://ci.appveyor.com/project/sn248/sundialr)    [![Travis-CI Build Status](https://travis-ci.org/sn248/sundialr.svg?branch=master)](https://travis-ci.org/sn248/sundialr)   [![CRAN_Status_Badge](http://www.r-pkg.org/badges/version/sundialr)](https://cran.r-project.org/package=sundialr) [![](https://cranlogs.r-pkg.org/badges/sundialr)]( https://CRAN.R-project.org/package=sundialr)
+[![](https://cranlogs.r-pkg.org/badges/grand-total/sundialr)]( https://CRAN.R-project.org/package=sundialr)
 
 <!-- badges: end -->