Fix compat with Redmine 4

init.rb

@@ -29,7 +29,7 @@ def init_redmine_wiki_notes
 end
 
 if Rails::VERSION::MAJOR >= 3
-  ActionDispatch::Callbacks.to_prepare do
+  Rails.configuration.to_prepare do
     init_redmine_wiki_notes
   end
 else
@@ -44,8 +44,8 @@ Redmine::Plugin.register :redmine_wiki_notes do
   author 'Daniel Seifert, Victor Laborie'
   description 'Allows adding different kinds of notes into a wiki page'
   url "http://www.github.com/vlaborie/redmine_wiki_notes" if respond_to?(:url)
-  version '0.0.3'
-  requires_redmine :version_or_higher => '2.3.0'
+  version '0.0.4'
+  requires_redmine :version_or_higher => '4.0.0'
 
   RedCloth3::ALLOWED_TAGS << "div"
 end