Removed duplicate default task definition

The default task was that which was defined last, so I'm assuming that's the
expected behaviour.

Rakefile

@@ -58,8 +58,5 @@ namespace :travis do
   task ci: %w(style spec)
 end
 
-# The default rake task should just run it all
-task default: %w(travis:ci integration)
-
 # The default rake task should just run it all
 task default: ['style', 'spec', 'integration:vagrant']