Add travis "build"

This allows me to activate greenkeeper, and lint PRs

Author: SimenB

.travis.yml

@@ -0,0 +1,3 @@
+language: node_js
+node_js: node
+

README.md

@@ -2,6 +2,7 @@
 > Add a JavaScript or CSS asset to the HTML generated by `html-webpack-plugin`
 
 [![NPM Version][npm-image]][npm-url]
+[![Build Status][travis-image]][travis-url]
 
 [![Dependency Status][david-image]][david-url]
 [![Dev Dependency Status][david-dev-image]][david-dev-url]
@@ -150,6 +151,8 @@ var webpackConfig = {
 
 [npm-url]: https://npmjs.org/package/add-asset-html-webpack-plugin
 [npm-image]: https://img.shields.io/npm/v/add-asset-html-webpack-plugin.svg
+[travis-url]: https://travis-ci.org/SimenB/add-asset-html-webpack-plugin
+[travis-image]: https://img.shields.io/travis/SimenB/add-asset-html-webpack-plugin/master.svg
 [david-url]: https://david-dm.org/SimenB/add-asset-html-webpack-plugin
 [david-image]: https://img.shields.io/david/SimenB/add-asset-html-webpack-plugin.svg
 [david-dev-url]: https://david-dm.org/SimenB/add-asset-html-webpack-plugin#info=devDependencies

package.json

@@ -10,7 +10,8 @@
     "lint": "node-version-gte-4 && eslint . || node-version-lt-4",
     "prepublish": "not-in-install && npm run compile || in-install",
     "postpublish": "git push --follow-tags",
-    "test": "npm run lint"
+    "pretest": "npm run lint",
+    "test": "echo No tests defined"
   },
   "repository": "SimenB/add-asset-html-webpack-plugin",
   "keywords": [