Merge pull request ogom#16 from dosyfier/fix-rails-6

Fix rails 6

Author: ogom

init.rb

@@ -1,3 +1,5 @@
+$LOAD_PATH.unshift "#{File.dirname(__FILE__)}/lib"
+
 require 'redmine_sidekiq/configure'
 require 'redmine_sidekiq/rails'
 

lib/redmine_sidekiq/configure.rb

@@ -7,9 +7,9 @@
 
 module RedmineSidekiq
   class Configure
-    file = File.join(Rails.root, 'plugins/redmine_sidekiq/config/sidekiq.yml')
+    file = File.join(::Rails.root, 'plugins/redmine_sidekiq/config/sidekiq.yml')
     if File.exist?(file)
-      config = YAML.load_file(file)[Rails.env]
+      config = YAML.load_file(file)[::Rails.env]
       redis_conf = config['redis'].symbolize_keys
     end