Update usage in README

[rbdr/serpentity] / package.json

{
  "name": "@serpentity/serpentity",
  "description": "An Entity-Component-System Engine",
  "version": "3.0.0",
  "type": "module",
  "contributors": [
    {
      "name": "Rubén Beltrán del Río",
      "email": "ben@nsovocal.com",
      "url": "https://unlimited.pizza"
    }
  ],
  "repository": {
    "type": "git",
    "url": "https://github.com/serpentity/serpentity.git"
  },
  "dependencies": {
    "events": "^3.1.0"
  },
  "devDependencies": {
    "@hapi/code": "^8.0.1",
    "@hapi/eslint-config-hapi": "^13.0.2",
    "@hapi/eslint-plugin-hapi": "^4.3.5",
    "@hapi/lab": "^22.0.3",
    "@babel/core": "^7.8.7",
    "@babel/preset-env": "^7.8.7",
    "babel-loader": "8.0.6",
    "eslint": "^6.8.0",
    "webpack": "^4.42.0",
    "webpack-cli": "^3.3.11"
  },
  "engines": {
    "node": ">= 12.0.0"
  },
  "browserslist": [
    "last 2 versions",
    "not IE",
    "not IE_mob"
  ],
  "scripts": {
    "build": "webpack --config ./config/webpack.js",
    "lint": "eslint lib",
    "test": "node test/integration.js"
  },
  "main": "./lib/serpentity.js"
}