title: Error when validating podspec
body: <p>I've created a cocoapod and I am attempting to validate its podspec, but I get this error:</p>
  
  <pre><code>➜  MyProject git:(master) ✗ pod spec lint MyProject.podspec
  
   -&gt; MyProject (1.0)
      - ERROR | Returned an unsuccessful exit code. You can use `--verbose` for more information.
      - ERROR | [iOS] Swift support uses dynamic frameworks and is therefore only supported on iOS &gt; 8.
      - NOTE  |  [BEROR]error: There is no SDK with the name or path 'watchos'
      - NOTE  | [watchOS]  error: There is no SDK with the name or path 'watchos'
  </code></pre>
  
  <p>I am using Xcode 7 beta, developing for ios9</p>