Upgrade Hugo to v0.49.2 (#102)

Khosrow Moossavi

15.19.2018 24c0c2fcc1f54293425fc6cf83fcc36181012034

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<section class="container centered">
  <div class="error">
    <h1>404</h1>
    <h2>Page Not Found</h2>
    <p>Sorry, this page does not exist.<br />You can head back to <a href="{{ .Site.BaseURL }}">homepage</a>.</p>
  </div>
</section>