[FEATURE] Make airbrake notifications work in the TYPO3 backend

Update README.md

[!!!][TASK] Switch to new official airbrake package

Merge pull request #1 from smichaelsen/task/support-typo3-v9

[TASK] Support TYPO3 v8 and v9

[BUGFIX] Ensure languageService exists

[FEATURE] GeneralExeptionHandler

[TASK] Rename current exception handler to new namespace

[TASK] Rename current exception handler to ContentObjectExceptionHandler

[FEATURE] Disable logging exceptions to file

[FEATURE] Disable logging exceptions to file

[FEATURE] Log Exceptions

Update composer.json

[TASK] Require dbtlr/php-airbrake

Update composer.json