title: Can a package be published to both github and npm? (with a single `npm publish`)
body: <p>I got access to the github package registry beta, just fiddled with it and followed the configuration steps to publish.</p>
  
  <p>The thing is, I published it correctly, but noticed it didn't publish to npm. Is there a way to publish in both registries with the same command? Does it make sense to have the package published in both registries?</p>
  
  <hr>
  
  <p>Also, my package name in the <code>package.json</code> is <code>@alvarocastro/quicksort</code> (<a href="https://help.github.com/en/articles/configuring-npm-for-use-with-github-package-registry#publishing-a-package" rel="noreferrer">as stated in the doc</a>) and the name in <a href="https://github.com/alvarocastro/quicksort/packages/22564" rel="noreferrer">the github page</a> ends up being that, but in the command example to install, the scope is duplicated, eg: <code>@alvarocastro/@alvarocastro/quicksort</code></p>
  
  <hr>
  
  <p>Here is the complete <code>package.json</code> file as a reference:</p>
  
  <pre><code>{
    "name": "@alvarocastro/quicksort",
    "version": "1.0.1",
    "description": "An implementation of the quicksort algorithm",
    "main": "index.js",
    "scripts": {
      "performance": "node performance.js",
      "test": "xo &amp;&amp; nyc ava",
      "coverage": "nyc report --reporter=text-lcov | coveralls"
    },
    "publishConfig": {
      "registry":"https://npm.pkg.github.com/@alvarocastro"
    },
    "repository": {
      "type": "git",
      "url": "git+https://github.com/alvarocastro/quicksort.git"
    },
    "keywords": [
      "quicksort",
      "sort",
      "algorithm"
    ],
    "author": "Alvaro Castro",
    "license": "MIT",
    "bugs": {
      "url": "https://github.com/alvarocastro/quicksort/issues"
    },
    "homepage": "https://github.com/alvarocastro/quicksort#readme",
    "devDependencies": {
      "ava": "2.3.0",
      "coveralls": "3.0.6",
      "nyc": "14.1.1",
      "xo": "0.24.0"
    }
  }
  </code></pre>