Updated mediawiki/extensions
Project: mediawiki/extensions/BounceHandler  918b48df4e7e5a11675e8b2ef2143adfee059988

Splitted the bounce headers extraction function, so as to ease testing

The bulky and redundant code in ProcessBounceWithRegex and
ProcessBounceWithPlancake was divided to tidy functions

Change-Id: Ifed586b5877bc08121e738feb977dbae25bf78b9