IoT hub: API version should be in URL querystring format (missing a '?')

[MrWFoulkes]

In the IoT hub examples, the username is set to "<broker>/<device id>/api-version=2018-06-30":

ArduinoCloudProviderExamples/examples/Azure IoT Hub/Azure_IoT_Hub_GSM/Azure_IoT_Hub_GSM.ino

Line 77 in 4ce13b8

username += "/api-version=2018-06-30";

ArduinoCloudProviderExamples/examples/Azure IoT Hub/Azure_IoT_Hub_NB/Azure_IoT_Hub_NB.ino

Line 79 in 4ce13b8

username += "/api-version=2018-06-30";

ArduinoCloudProviderExamples/examples/Azure IoT Hub/Azure_IoT_Hub_WiFi/Azure_IoT_Hub_WiFi.ino

Line 69 in 4ce13b8

username += "/api-version=2018-06-30";

It should be "<broker>/<device id>/?api-version=2018-06-30".

According to IoT hub docs here: https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-mqtt-support