Adding support for Swift 3 GA.

Author: rolivieri

compile-extensions/bin/download_dependency

@@ -66,6 +66,7 @@ if translated_uri.nil?
       custom_swift_version = "#{custom_swift_version}-RELEASE"
     end
   end
+  
   swift_file = "#{custom_swift_version}-ubuntu14.04.tar.gz"
   translated_uri = "https://swift.org/builds/#{snapshot_type}/ubuntu1404/#{custom_swift_version}/#{swift_file}"
   debug "DEBUG: Using the following URL for downloading the specified dependency: #{translated_uri}"