title: 'String' does not conform to expected type 'CVarArg'
body: <p>When I'm trying to log using <code>NSLog</code>, I'm facing this error:</p>
  
  <blockquote>
  <pre><code>remote: /tmp/build_f459d376d1bc10ac2e93e52575ac5ea9/Sources/App/main.swift:368:49: error: argument type 'String' does not conform to expected type 'CVarArg'
  remote:                     NSLog("FILE NOT AVAILABLE", "TESTNOTI")
  remote:                                                 ^~~~~~~~~~
  remote:                                                            as! CVarArg
  </code></pre>
  </blockquote>
  
  <p><strong>Here is my code:</strong></p>
  
  <pre><code>if fileManager.fileExists(atPath: (drop.config["servers", "default", "KeyURL"]?.string ?? "default")) {
      NSLog("FILE AVAILABLE", "TESTNOTI")
  } else {
      NSLog("FILE NOT AVAILABLE", "TESTNOTI")
  }
  </code></pre>
  
  <p>Why does this happen and how can I fix it?</p>