title: Podspec s.vendored_frameworks not working
body: <p>Maybe I misunderstood the way of <code>s.ios.vendored_frameworks</code> work but I'm trying to use/integrate the <a href="https://www.sinch.com/ios-sdk" rel="noreferrer">Sinch.framework</a> in my own SDK (for the voip part) but in my ReplaceMe.swift I'm not able to import or use any stuff from it</p>
  
  <p>My hierarchy after I used <code>s.ios.vendored_frameworks</code> is the following
  <a href="https://i.stack.imgur.com/lls7o.png" rel="noreferrer"><img src="https://i.stack.imgur.com/lls7o.png" alt="My hierarchy"></a></p>
  
  <p>My podspec (last version of cocoapods is used)</p>
  
  <pre><code>  s.ios.source_files = 'PoCSDK/Classes/**/*','PoCSDK/Frameworks/Sinch.frameworks/Headers/*'
    s.ios.vendored_frameworks = 'PoCSDK/Sinch.framework'
    s.ios.public_header_files = 'PoCSDK/Frameworks/Sinch.frameworks/Headers/*'
  
    s.resource_bundles = {
       'NoddsSDK' =&gt; ['PoCSDK/Assets/*']
    }
  
    s.frameworks = 'UIKit', 'MapKit', 'AudioToolbox', 'AVFoundation'
    s.ios.dependency 'Alamofire', '~&gt; 4.5'
    s.ios.dependency 'Socket.IO-Client-Swift'
    s.ios.dependency 'ReachabilitySwift'
  </code></pre>