title: Electron-builder release tries to publish to Github and complains about GH_Token
body: <p>running the <code>release</code> script without <code>publish</code> option tries to publish the build to GitHub ( and fails while complaining about not being able to find GHToken! )</p>
  
  <p><code>Error: GitHub Personal Access Token is not set, neither programmatically, nor using env "GH_TOKEN"</code></p>
  
  <hr>
  
  <p>Setting <code>"publish": "never"</code> will fail also complaining about not being able to find module <code>electron-publisher-never</code>!</p>
  
  <p><code>Error: Cannot find module 'electron-publisher-never'</code></p>
  
  <hr>
  
  <p>It all happens while the project is built but build scripts exits non-zero!</p>
  
  <p>I'm using the latest version of electron-builder.
  my build script:</p>
  
  <pre><code> "build": {
  "appId": "eu.armand.[****]",
  "copyright": "Copyright © 2017 mim_Armand",
  "productName": "[****]",
  "mac": {
    "publish": "never",
    "category": "public.app-category.[****]",
    "icon": "assets/icons/mac/icon.icns"
  }
  </code></pre>
  
  <p>Any idea what's going on or if I'm doing it wrong?!</p>
  
  <p>,m</p>