Moved the playground to the bottom of the workspace.

Alamofire.xcworkspace/contents.xcworkspacedata

 <?xml version="1.0" encoding="UTF-8"?>
 <Workspace
    version = "1.0">
-   <FileRef
-      location = "group:Alamofire.playground">
-   </FileRef>
    <FileRef
       location = "group:Alamofire.xcodeproj">
    </FileRef>
    <FileRef
       location = "group:iOS Example.xcodeproj">
    </FileRef>
+   <FileRef
+      location = "group:Alamofire.playground">
+   </FileRef>
 </Workspace>