add linting (eslint) to travis

.travis.yml

@@ -8,6 +8,6 @@ notifications:
 before_install:
     - npm install prom-client
 script:
+    - npm run lint
     - npm test
     - npm run dtslint
-

package.json

@@ -17,6 +17,7 @@
   "types": "types",
   "scripts": {
     "test": "node_modules/jasme/run.js",
+    "lint": "eslint src",
     "coverage": "make coverage",
     "dtslint": "dtslint types"
   },