fix: wait for unsub before deleting local channel #88
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Description
Local channels map is updated before awaiting actual sub/unsub. It becomes a problem with unsubscriptions. The channel is deleted from local map before actually unsubscribing. If a new message is received between unsub is triggered and unsub finishes, it throws an error. Because
this.channels.get('channel')
is undefined during that period.This is solving the same issue mentioned in #87
CHANGELOG