MultiThreadServer#stop and #reload print uncaught errors
EmbeddedServer#stop and #reload print uncaught errors
ProcessManager: added enable_heartbeat option
ProcessManager doesn't call fcntl on pipe pairs if F_SETFD or FD_CLOEXEC is not defined
MultiProcessWorker: fixed worker_chuser handling
ProcessManager: fixed to call Monitor#tick correctly
added ProcessManager#spawn
v1.5.5
ServerEngine doesn't support rbx-19mode so far
updated README.md