Cannot find AwaitingAck (emqttd#597)
EMQ V2.1 crash when public with QoS = 2 (emqttd#919)
Support pbkdf2 hash (emqttd#940)
Add src/emqttd.app.src to be compatible with rebar3 (emqttd#920)
Add more test cases (emqttd#944)
CRASH REPORT Process <0.1498.0> with 0 neighbours crashed with reason: {ssl_error,{tls_alert,"certificate unknown"}} in esockd_connection:upgrade (emqttd#915)
auth.redis.password_hash = plain by default (emq-auth-redis#20)