2.4.0
- fixed bug trying to email a nonexistent backup;
VALID_COMPRESSIONSandVALID_EXTENSIONSconstants have been replaced by
getValidCompressions()andgetValidExtensions()methods provided by the
BackupTraitclass;- replaced
InternalErrorExceptionwithInvalidArgumentExceptionand
RuntimeException. This allows compatibility with CakePHP 3.6 branch.