Specified dependent library versions

Author: graham22

code/ESP32/ClassicMQTT/platformio.ini

@@ -15,10 +15,10 @@ framework = arduino
 monitor_speed = 115200
 
 lib_deps =
-  ArduinoJson
-  IotWebConf@^3.2.0   ; V3.x of IotWebConf
-  AsyncMqttClient
-  esp32ModbusTCP  
+  bblanchon/ArduinoJson@^7.0.4
+  prampec/IotWebConf@^3.2.1   ; V3.x of IotWebConf
+  marvinroger/AsyncMqttClient@^0.9.0
+  bertmelis/esp32ModbusTCP@^0.0.1  
 
 build_flags =
     -D MQTT_MAX_PACKET_SIZE=1024