Support MQTT retain flag on publishing.#88

patthoyts wants to merge 2 commits intoadafruit:masteradafruit/Adafruit_MQTT_Library:masterfrom

patthoyts:pt/issue-20-support-retain-for-publishpatthoyts/Adafruit_MQTT_Library:pt/issue-20-support-retain-for-publishCopy head branch name to clipboard