Version 4.0.0

- The Authentication Proxy is now packaged with and runs on Python 3. - When installed on Windows, directory permissions restrict access to the conf directory to the built-in Administrators group. - Improved directory sync performance when syncing large groups from Active Directory. - Fixed a bug causing RADIUS authentications to fail for usernames with non-ASCII characters. - Duo application ikey values are now properly captured in the authentication log during RADIUS authentication.