title: The 'gems' configuration option edit name
body: <p>When I use the latest jekyll and start its server, a certain warning below shows up:</p>
  
  <p>Configuration file: C:/Users/recup/Grape-Theme/_config.yml
         Deprecation: The 'gems' configuration option has been renamed to 'plugins'. Please update your config file accordingly.</p>
  
  <p>I followed the following steps to solve the problem:
  1. Open your _config.yml file
  2. Find the line beginning with gems:
  3. Replace gems with plugins</p>
  
  <p>But, the problem continue. What can I do?</p>