title: Meteor module not found on prod, works fine in dev
body: <p>I've recently been adding flow router to my meteor project. Works fine in dev, I deploy on my dev server, a heroku dyno <a href="https://github.com/AdmitHub/meteor-buildpack-horse" rel="nofollow noreferrer">using horse buildpack</a>.
  And surprise, my app doesn't work, the js console logs an error:</p>
  
  <pre><code>Uncaught Error: Cannot find package "kadira:flow-router". Try "meteor add kadira:flow-router".
  </code></pre>
  
  <p>I've added the module to meteor by doing this:</p>
  
  <pre><code>meteor add kadira:flow-router
  </code></pre>
  
  <p>I'm my route.jsx is in /client/route/route.jsx</p>
  
  <pre><code>import { FlowRouter }  from 'meteor/kadira:flow-router';
  </code></pre>
  
  <p>I don't get why my dev/prod are not the same. Any hint ?
  I didn't find any error in the deployment logs on heroku
  I also realized something, when heroku builds the prod, it seems to be using Meteor 1.8.1 while I've updated my meteor version to the last 1.10.smthg. How does that happen ? Is it linked ?</p>