title: ActionController::RoutingError (No route matches [GET] "/assets/underscore-min.map")
body: <p>I'm getting this annoying error everytime I refresh a page in my rails 5 app.
  I need underscore.js for gmaps4rails. This underscore.js file is at vendor/javascript/underscore.js, like the tutorial says (<a href="https://github.com/apneadiving/Google-Maps-for-Rails" rel="nofollow noreferrer">Gmaps4Rails Github repo</a>).</p>
  
  <p>Does anyone have a good solution to solve or supress it?</p>