Changes

• 5ba7a65e Issue #232: update to Checkstyle 8.33
• 9d473b4d Use JUnit 5
• 1c057d11 avoid flickering during filter update
• 945d9eff Upgrade dom4j dependency
• 71722899 Replace boxing constructors
• c1023362 Configure target platform for Java 8
• 484c008a Upgrade Maven dependencies

Please read the Checkstyle release notes for details on recent and potentially breaking changes in Checkstyle. Checkstyle configuration files potentially need to be adapted to this version.