<p>Seems like the INSTALL.md part that says about bundle install is outdated.<br>
With the <code>bundle install</code> command it gives an error<br>
With the <code>gem install bundle</code> command it works.<br>
<a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/51020710/60609843-f5722880-9d98-11e9-93f3-516a13a2b4d8.png"><img src="https://user-images.githubusercontent.com/51020710/60609843-f5722880-9d98-11e9-93f3-516a13a2b4d8.png" alt="bundle" style="max-width:100%;"></a></p>

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