use wt serve for local development

package.json

@@ -3,7 +3,7 @@
     "version": "0.1.0",
     "private": true,
     "scripts": {
-        "start": "node webtask-medium.js",
+        "start": "wt serve webtask-medium.js",
         "test": "eslint ./{src,public}/**/*.js"
     },
     "dependencies": {

webtask-medium.js

@@ -54,6 +54,4 @@ app.get('/:username/raw', (req, res) => {
     })
 })
 
-app.listen(4000, () => console.log('Example app listening on localhost:4000!')) // eslint-disable-line no-console
-
 module.exports = webtask.fromExpress(app)