Fixes #181 and #185. Listener#listen? considers start/stopped state. Listeners can be restarted.
Merge pull request #186 from adambray/fixes_for_listen_and_restart

Fix Listener#listen? considers start/stopped state. Listeners can be restarted.

Close #185.
2.1.0 is not allowed to failed
Update my domain (thibaud.me => thibaud.gg)
Release 2.4.1