title: Swift: Jazzy failing to run xcodebuild
body: <p>I'm trying to generate some documentation for. my project using Jazzy. However, when I run <code>jazzy</code> from the command line I'm getting the following output:</p>
  <pre><code>Could not successfully run `xcodebuild`.
  Please check the build arguments.
  Saved `xcodebuild` log file: /var/folders/nd/t1rlxsp94kgbll0v834jnc0h0000gp/T/xcodebuild-84D58051-E84E-40D8-A4E7-E080B83D7117.log
  Failed to generate documentation
  Traceback (most recent call last):
      7: from /usr/local/bin/jazzy:23:in `&lt;main&gt;'
      6: from /usr/local/bin/jazzy:23:in `load'
      5: from /usr/local/lib/ruby/gems/2.7.0/gems/jazzy-0.13.6/bin/jazzy:15:in `&lt;top (required)&gt;'
      4: from /usr/local/lib/ruby/gems/2.7.0/gems/jazzy-0.13.6/lib/jazzy/doc_builder.rb:79:in `build'
      3: from /usr/local/lib/ruby/gems/2.7.0/gems/jazzy-0.13.6/lib/jazzy/doc_builder.rb:79:in `chdir'
      2: from /usr/local/lib/ruby/gems/2.7.0/gems/jazzy-0.13.6/lib/jazzy/doc_builder.rb:81:in `block in build'
      1: from /usr/local/lib/ruby/gems/2.7.0/gems/jazzy-0.13.6/lib/jazzy/sourcekitten.rb:266:in `run_sourcekitten'
  /usr/local/lib/ruby/gems/2.7.0/gems/jazzy-0.13.6/lib/jazzy/executable.rb:36:in `execute_command': /usr/local/lib/ruby/gems/2.7.0/gems/jazzy-0.13.6/bin/sourcekitten [&quot;doc&quot;, &quot;--&quot;] (RuntimeError)
  
  Running xcodebuild
  
  Could not successfully run `xcodebuild`.
  
  Please check the build arguments.
  
  Saved `xcodebuild` log file: /var/folders/nd/t1rlxsp94kgbll0v834jnc0h0000gp/T/xcodebuild-84D58051-E84E-40D8-A4E7-E080B83D7117.log
  
  Failed to generate documentation
  </code></pre>
  <p>Why is this failing to run when from xcode my project build with no issues</p>