• Added CSRF protection support.
  
• Added support for permessage-deflate WebSocket compression.
  
• Added csrf_protect method to Mojolicious::Validator::Validation.
  
• Added build_message method to Mojo::Transaction::WebSocket.
  
• Added csrf_token attribute to Mojolicious::Validator::Validation.
  
• Added compressed and context_takeover attributes to Mojo::Transaction::WebSocket.
  
• Added csrf_token helper to Mojolicious::Plugin::DefaultHelpers.
  
• Added csrf_field helper to Mojolicious::Plugin::TagHelpers.
  
• Removed deprecated mode specific methods in application class.
  
• Relicensed all artwork to CC-SA version 4.0.