• Removed support for user/group switching, because it never worked correctly, which means that this security feature
  has become an attack vector itself. If you depend on this functionality, you can now use the CPAN module
  Mojolicious::Plugin::SetUserGroup instead.
  
• Removed group and user attributes from Mojo::Server.
  
• Removed setuidgid method from Mojo::Server.
  
• Removed group and user settings from Hypnotoad.
  
• Removed -g/--group and -u/--user options from daemon and prefork commands.
  
• Added next_tick method to Mojo::Reactor::Poll.
  
• Improved next_tick callbacks to run in the same order in which they were registered.