Log Message:
py-flufl.bounce: update to 4.0

4.0 (2021-06-16)
Added another string to the stop looking strings in the yahoo detector.
Detectors are now run in a defined order and stop on the first detection.
3.0.2 (2021-02-09)
Fixed microsoft.py which has been broken forever.
Added recognition for yet another non-complaint Yahoo DSN.
Added recognition for a non-compliant DSN from an unknown MTA.
Fixed missing () in the groupwise detector.
3.0.1 (2020-01-17)
Added recognition for a non-compliant opensmtpd DSN with Action: error.
Caught a possible UnicodeEncodeError in simplematch.py.
Fixed simplmatch.py to not return results that don’t resemble email addresses.