1.21.0

• Break: Reverted the addition of $context when the ErrorHandler handles regular php errors from 1.20.0 as it was causing issues
• Added support for more formats in RotatingFileHandler::setFilenameFormat as long as they have Y, m and d in order
• Added ability to format the main line of text the SlackHandler sends by explictly setting a formatter on the handler
• Added information about SoapFault instances in NormalizerFormatter
• Added $handleOnlyReportedErrors option on ErrorHandler::registerErrorHandler (default true) to allow logging of all errors no matter the error_reporting level