V3.1.0: Add some repository methods and fix a bug

Added

• Add FrontendUser(WithCountry)Repository::existsWithUsername (#69)
• Add FrontendUser(WithCountry)Repository::findOneByUsername (#68)

Changed

• Reuse initializeObject from the constructor (#54)

Fixed

• Fix the German label for static_info_country (#68)

V4.0.0: Drop support for TYPO3 9LTS

Changed

• Reuse initializeObject from the constructor (#54)
• Switch the code coverage collection to Coveralls (#53)

Removed

• Drop support for TYPO3 V9 (#49)

Fixed

• Make sure the necessary directories get created when running the tests (#56)

V3.0.0: Completely rewritten for TYPO3 V9/V10

Completely rewritten for TYPO3 V9/V10.