v2.2.0

• Added drag and drop support for attachment input field.
• Improved "Link thumbnail?" option. Link to a new tab (thank you @graylaurenm) and an attachment page is now supported.
• Fixed bug with "Manually moderate comments with attachments" option.
• Removed "Attach to commented post?" option from the Settings page. You can use the dco_ca_attach_to_post filter instead.