6.2.1.17 20181017
* Enable updated non-blocking PubSubClient as default MQTT client
* Update TasmotaModbus and TasmotaSerial libraries for support of serial 8N2 communication
* Add support for Pzem-003/017 DC Energy monitoring module (#3694)
* Change support for Pzem-014/016 AC Energy monitoring module (#3694)