title: Vapor Linux Build with SwiftyBeaver Failing
body: <p>I've been trying to build my Vapor Project using Docker. I am using the default web.Dockerfile. 
  However I am running into this error:</p>
  
  <p><code>/App/.build/checkouts/SwiftyBeaver/Sources/FileDestination.swift:135:27: error: use of unresolved identifier 'NSFileCoordinator'</code></p>
  
  <p>I am using <code>https://github.com/vapor-community/swiftybeaver-provider</code> as well (however I the error is from SwiftyBeaver itself). The error seems to be from building for Linux - it builds find locally out of Docker. Any help would be much appreciated!</p>