Version 3.1.1

• Ensure govuk_date_field works correctly when omit_day: true. Rails ignores the field when the day segment parameter is missing, this change follows the Rails convention and adds a hidden day field. Thank you @thomasleese for diagnosing and fixing this #376
• Add a configuration flag that disables the auto-bolding of radio button labels when hints are present. The form builder's default behaviour will remain the same (it matches an older version of the design system's guidance that suggested doing this which was removed in 2020) to avoid breakages but may be toggled at the next major release. Thanks @paulrobertlloyd for suggesting this #373
• Fix the copyright information in the LICENCE 45bf925