Add lint script to CI

.travis.yml

@@ -8,3 +8,7 @@ node_js:
 
 before_script:
   - cp test/config.json config.json
+
+script:
+  - npm run lint
+  - npm test

package.json

@@ -6,6 +6,7 @@
   "scripts": {
     "dev": "nodemon server.js",
     "start": "NODE_ENV=production node server.js",
+    "lint": "eslint .",
     "test": "mocha"
   },
   "author": "nioc <dev@nioc.eu>",