Update Adafruit_MQTT_Client.cpp to remove use of min()
Update Adafruit_MQTT_Client.cpp to remove use of min()

see https://github.com/adafruit/Adafruit_MQTT_Library/issues/106  for discussion of link failures after upgrading esp8266 community library  BSP to version 2.4.0  --  removing the use of min() allows for successful compilation,link and execution.

Replace call to min() with ternary statement to accomplish same action.
adafruit/Adafruit_MQTT_Library