Added travis build

.travis.yml

@@ -0,0 +1,3 @@
+language: node_js
+node_js:
+  - "8"

README.md

@@ -1,5 +1,7 @@
 # StackEdit
 
+[![Build Status](https://img.shields.io/travis/benweet/stackedit.svg?style=flat)](https://travis-ci.org/benweet/stackedit) [![NPM version](https://img.shields.io/npm/v/stackedit.svg?style=flat)](https://www.npmjs.org/package/stackedit)
+
 StackEdit is a full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.
 
 https://stackedit.io/.

package.json

@@ -14,7 +14,8 @@
     "build": "node build/build.js && npm run build-style",
     "build-style": "webpack --config build/webpack.style.conf.js",
     "lint": "eslint --ext .js,.vue src server",
-    "preversion": "npm run lint",
+    "test": "npm run lint",
+    "preversion": "npm run test",
     "postversion": "git push origin master --tags && npm publish",
     "patch": "npm version patch -m \"Tag v%s\"",
     "minor": "npm version minor -m \"Tag v%s\"",