Remove manual port from http-server

Author: lucasmotta

package.json

@@ -21,7 +21,7 @@
  "gyroscope"
  ],
  "scripts": {
- "start": "http-server ./demo -p 3000",
+ "start": "http-server ./demo",
  "build": "rollup -c",
  "lint": "standard src/*.js",
  "pretest": "npm run lint",