custom payloads and bugfixes in test case

testing module improvements

Update dependency on calvinalkan/interfaces to 0.1.2

fixed broken link in CHANGELOG.md

Update config.yml

fixed type hints marking closures as wrong parameters for listen() (#4)

default values now get returned if listeners are registered but none …

…of them handled the event conditionally

fix bug in ClassListener.php that caused shouldListen to not be calle…

…d when a Listener got created as a string callable Listener@handle

update base-container dependency to a tagged release instead of dev-m…

…aster