Bugfix and Enhancements
Feature: Add etc/ssl_dist.conf file for erlang SSL distribution (emq-relx#178)
Feature: Add node.ssl_dist_optfile option and etc/ssl_dist.conf file (#1512)
Feature: Support Erlang Distribution over TLS (#1512)
Improve: Tune off the 'tune_buffer' option for external MQTT connections (#1512)
emq-sn
Clean registered topics if mqtt-sn client send a 2nd CONNECT in connected state (#76)
Upgrade the esockd library to v5.2.1 (#76)
emq-auth-http
Remove 'password' param from ACL and superuser requests (#66)