use Travis

.Rbuildignore

@@ -1,3 +1,4 @@
+^\.travis\.yml$
 ^apexcharter\.Rproj$
 ^\.Rproj\.user$
 ^dev$

.travis.yml

@@ -0,0 +1,5 @@
+# R for travis: see documentation at https://docs.travis-ci.com/user/languages/r
+
+language: R
+sudo: false
+cache: packages

README.md

@@ -2,6 +2,8 @@
 
 > Htmlwidget for [apexcharts.js](https://github.com/apexcharts/apexcharts.js)
 
+[![Travis build status](https://travis-ci.org/dreamRs/apexcharter.svg?branch=master)](https://travis-ci.org/dreamRs/apexcharter)
+
 :construction: :warning: Under development !! API will change (and this doesn't work properly in RStudio viewer for now) :warning: :construction:
 
 ## Installation