title: Heroku node.js app not compatible with buildpack
body: <p>I tried uploading my discord bot to heroku today, but everytime I use <code>git push heroku master</code> it will give me the following error:</p>
  
  <pre><code>remote: Compressing source files... done.
  remote: Building source:
  remote:
  remote: -----&gt; App not compatible with buildpack: https://codon-
  buildpacks.s3.amazonaws.com/buildpacks/heroku/nodejs.tg
  remote:        More info: 
  https://devcenter.heroku.com/articles/buildpacks#detection-failure
  remote:
  remote:  !     Push failed
  remote: Verifying deploy...
  remote:
  remote: !       Push rejected to sjak-bot.
  remote:
  To https://git.heroku.com/sjak-bot.git
   ! [remote rejected] master -&gt; master (pre-receive hook declined)
  error: failed to push some refs to 'https://git.heroku.com/sjak-bot.git'
  </code></pre>
  
  <p>I already did <code>heroku buildpacks:set heroku/nodejs</code>, added the node.js and npm version to the package.json, but it still gives the same error.</p>
  
  <p>The bot is written in javascript btw</p>