added download badge

Author: dirmeier

README.md

@@ -1,8 +1,8 @@
 <h1 align="center"> diffusr </h1>
 
-[![Build Status](https://travis-ci.org/dirmeier/diffusr.svg?branch=master?color=red)](https://travis-ci.org/dirmeier/diffusr)
+[![Build Status](https://travis-ci.org/dirmeier/diffusr.svg?branch=master)](https://travis-ci.org/dirmeier/diffusr)
 [![codecov](https://codecov.io/gh/dirmeier/diffusr/branch/master/graph/badge.svg)](https://codecov.io/gh/dirmeier/diffusr)
-[![CRAN](http://www.r-pkg.org/badges/version/diffusr)](https://cran.r-project.org/package=diffusr)
+[![CRAN](http://www.r-pkg.org/badges/version/diffusr?color=brightgreen)](https://cran.r-project.org/package=diffusr)
 [![Downloads](http://cranlogs.r-pkg.org/badges/diffusr?color=brightgreen)](https://cran.r-project.org/package=diffusr)
 
 Network diffusion algorithms in R.