Log Message:
www/nginx*: update third-party nchan module, 1.3.6 -> 1.3.7

Bump PKGREVISIONs.

<ChangeLog>

fix: repeated DELETE requests can leave unresponsive subscribers connected to a \ 
channel
fix: channel info subscriber count incorrect when using Redis following unclean \ 
worker exit
     (Thanks, Steven Green)
feature: manually set Redis server roles to master or slave
fix: Redis server blacklist was only applied in cluster mode
     (Thanks, piotr-lwks)
fix: Nchan may fail to connect to non-cluster Redis if more than 1 server is \ 
specified
     (Thanks, Mike Baroukh)
fix: Some invalid message IDs may result in a worker crash
fix: Nchan may fail to reconnect ro a Redis cluster when using many workers due \ 
to a race condition
     (Thanks, Fabio Urquiza)
fix: subscriber info may be incorrect for Redis version >=7
fix: Redis cluster may fail to reconnect to a cluster without consensus
     (Thanks, Fabio Urquiza)

</ChangeLog>