DEV: update holiday definitions (#130)

DEV: update holiday definitions (#130)

diff --git a/plugin.rb b/plugin.rb
index be01110..66f61ff 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -6,7 +6,7 @@
 # author: Daniel Waterworth, Joffrey Jaffeux
 # url: https://github.com/discourse/discourse-calendar
 
-gem 'holidays', '8.2.0', require: false
+gem 'holidays', '8.4.1', require: false
 gem 'rrule', '0.4.2', require: false
 
 load File.expand_path('../lib/calendar_settings_validator.rb', __FILE__)

GitHub sha: aa7086b1

This commit appears in #130 which was approved by CvX. It was merged by SamSaffron.