[replicants] add missing _messageHandlers property
[replicants] add missing _messageHandlers property

[ci skip]

madmatt/nodecg,nodecg/nodecg,IgorCandido/igrcnddStreamNotifications,nseckinoral/nodecg,nseckinoral/nodecg,madmatt/nodecg,nodecg/nodecg,nodecg/nodecg,IgorCandido/igrcnddStreamNotifications