add travis

Author: bukinoshita

.travis.yml

@@ -0,0 +1,4 @@
+language: node_js
+node_js:
+  - '8'
+  - '7'

readme.md

@@ -1,5 +1,9 @@
 ![](https://github.com/bukinoshita/taskr/blob/master/media/banner.png)
 
+[![Build Status](https://travis-ci.org/bukinoshita/taskr.svg)](https://travis-ci.org/bukinoshita/taskr)
+[![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/sindresorhus/xo)
+[![styled with prettier](https://img.shields.io/badge/styled_with-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
+
 ## Usage
 
 [Download the latest release!](https://taskr.now.sh/download)