Add TravisCI

Author: mxstbr

.travis.yml

@@ -0,0 +1,11 @@
+language: node_js
+node_js:
+  - 8
+script:
+  - node --version
+  - yarn --version
+  - yarn run test
+cache:
+  yarn: true
+  directories:
+    - node_modules

README.md

@@ -1,6 +1,7 @@
 draft-js-markdown-plugin
 ==================================
 
+[![Build Status](https://travis-ci.org/withspectrum/draft-js-markdown-plugin.svg?branch=master)](https://travis-ci.org/withspectrum/draft-js-markdown-plugin)
 [![npm](https://img.shields.io/npm/v/draft-js-markdown-plugin.svg)][npm]
 <!-- [![Coverage Status](https://coveralls.io/repos/github/withspectrum/draft-js-markdown-plugin/badge.svg?branch=master)](https://coveralls.io/github/withspectrum/draft-js-markdown-plugin?branch=master) -->