title: cocoapods Google Mobile ads does not generate .xcworkspace file
body: <p>I am exporting a project from Unity3d to xcode that uses the last GoogleMobileAds package.
  I have installed and updated cocoapods and also have the famous podfile containing de following lines:</p>
  
  <pre><code>source 'https://github.com/CocoaPods/Specs.git'
  install! 'cocoapods', :integrate_targets =&gt; false
  platform :ios, ‘8.0’
  
  target ‘MyProject’ do
      pod 'Google-Mobile-Ads-SDK', '~&gt; 7.14’
      pod 'Firebase/Core'
      pod 'Firebase/AdMob'
  end
  </code></pre>
  
  <p>and I run </p>
  
  <pre><code>pod install
  </code></pre>
  
  <p>and</p>
  
  <pre><code>pod update
  </code></pre>
  
  <p>successfully</p>
  
  <p>dependancies are downloaded alright, as you can see the results below:</p>
  
  <pre><code>Updating local specs repositories
  
  CocoaPods 1.2.0.beta.1 is available.
  To update use: `sudo gem install cocoapods --pre`
  [!] This is a test version we'd love you to try.
  
  For more information, see https://blog.cocoapods.org and the CHANGELOG for this version at https://github.com/CocoaPods/CocoaPods/releases/tag/1.2.0.beta.1
  
  Analyzing dependencies
  Downloading dependencies
  Using Firebase (3.9.0)
  Using FirebaseAnalytics (3.5.1)
  Using FirebaseCore (3.4.4)
  Using FirebaseInstanceID (1.0.8)
  Installing Google-Mobile-Ads-SDK (7.14.0)
  Using GoogleInterchangeUtilities (1.2.2)
  Using GoogleSymbolUtilities (1.1.2)
  Using GoogleToolboxForMac (2.1.0)
  Generating Pods project
  Skipping User Project Integration
  Sending stats
  Pod installation complete! There are 3 dependencies from the Podfile and 8 total pods installed.
  </code></pre>
  
  <p>According to both cocoapods and google mobile ads documentation, I will need to continue with "MyProject.xcworkspace" but the file is nowhere to be found.</p>
  
  <p>any suggestions?</p>