Redmine

The following change will fix the warning.
I am setting the target version to 6.0.2.

Index: lib/redmine/imap.rb
===================================================================
--- lib/redmine/imap.rb    (リビジョン 23266)
+++ lib/redmine/imap.rb    (作業コピー)
@@ -29,7 +29,7 @@
         starttls = !imap_options[:starttls].nil?
         folder = imap_options[:folder] || 'INBOX'

-        imap = Net::IMAP.new(host, port, ssl)
+        imap = Net::IMAP.new(host, port: port, ssl: ssl)
         if starttls
           imap.starttls
         end

Committed the fix in r23268. Thank you for reporting the issue.

Merged the change in the trunk into the 6.0-stable branch in r23272.