title: Encoding::Undefined: ConversionError at / "\xC3" from ASCII-8BIT to UTF-8
body: <p>I've been trying to update from Sprockets 3 to Sprockets 4 but I'm getting the following error: <code>Encoding::UndefinedConversionError at / "\xC3" from ASCII-8BIT to UTF-8</code></p>
  
  <p>The error happens in the following line: <code>&lt;%= javascript_include_tag "c/components/App", "data-turbolinks-track" =&gt; 'reload' %&gt;</code> and I can't understand why.</p>