Add active badge to README

[ci skip]

Author: gaborcsardi

inst/README.Rmd

@@ -10,6 +10,7 @@ knitr::opts_chunk$set(
 
 > Detect the Language of Text
 
+[![Project Status: Active - The project has reached a stable, usable state and is being actively developed.](http://www.repostatus.org/badges/latest/active.svg)](http://www.repostatus.org/#active)
 [![Linux Build Status](https://travis-ci.org/MangoTheCat/franc.svg?branch=master)](https://travis-ci.org/MangoTheCat/franc)
 [![Windows Build
 status](https://ci.appveyor.com/api/projects/status/github/mangothecat/franc?svg=true)](https://ci.appveyor.com/project/gaborcsardi/franc)

inst/README.md

@@ -5,6 +5,7 @@
 
 > Detect the Language of Text
 
+[![Project Status: Active - The project has reached a stable, usable state and is being actively developed.](http://www.repostatus.org/badges/latest/active.svg)](http://www.repostatus.org/#active)
 [![Linux Build Status](https://travis-ci.org/MangoTheCat/franc.svg?branch=master)](https://travis-ci.org/MangoTheCat/franc)
 [![Windows Build
 status](https://ci.appveyor.com/api/projects/status/github/mangothecat/franc?svg=true)](https://ci.appveyor.com/project/gaborcsardi/franc)