Ensure all handlers are explicitly closed on kernel shutdown#377

andy-educake wants to merge 3 commits intosymfony:4.xsymfony/monolog-bundle:4.xfrom

andy-educake:376-add-handler-manager-to-close-handlersandy-educake/monolog-bundle:376-add-handler-manager-to-close-handlersCopy head branch name to clipboard