title: webpack-dev-server errors with "command not found: webpack-dev-server"
body: <p>don't really see why I can't get this to run... I've done the following.</p>
  
  <pre><code>npm install -g webpack webpack-dev-server
  </code></pre>
  
  <p>confirmed that both installed successfully.</p>
  
  <p>Now, when I try and execute <code>webpack-dev-server</code>, I get the following:</p>
  
  <pre><code>$ webpack-dev-server --inline --hot
  zsh: command not found: 'webpack-dev-server'
  </code></pre>
  
  <p>Never run into this as all my other npm modules load/run fine, both locally and globally. I've tried installing it locally to a project as well (adding to package.json, npm install, yadda yadda..) and receive the same error.</p>
  
  <p>Am I missing something?</p>