title: Yarn package won't upgrade globally (after migrating from NPM)
body: <p>I was trying to run <code>yarn global upgrade generator-jhipster</code> but even though it seemed like it was working and installing the latest version, when I would run <code>yo jhipster</code> It would still be on an old version and would prompt me to run <code>yarn global upgrade generator-jhipster</code></p>
  
  <p>I was running on OSX (Mac)</p>
  
  <p>I had just recently started using Yarn. I was previously using NPM but uninstalled NPM.</p>
  
  <p><code>$HOME/.config/yarn/global/node_modules/.bin</code> was in my path, so that wasn't the issue.</p>