Update readme.md to reflect missing AMQP_WS + x509 support status

Author: timtay-microsoft

readme.md

@@ -83,7 +83,7 @@ For more details on what platforms this SDK supports, see [this document](./supp
 
 | Features                                                                                                         | mqtt                     | mqtt-ws                  | amqp                     | amqp-ws                  | https                    | Description                                                                                                                                                                                                                                                                                                                                 |
 |------------------------------------------------------------------------------------------------------------------|--------------------------|--------------------------|--------------------------|--------------------------|--------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| [Authentication](https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-security-deployment)                     | :heavy_check_mark:       | :heavy_check_mark:      | :heavy_check_mark:      | :heavy_check_mark:      | :heavy_check_mark:       | Connect your device to IoT Hub securely with supported authentication, including private key, SASToken, X-509 Self Signed over MQTT, AMQPS and HTTPS, and X-509 Certificate Authority (CA) Signed.                                                     |
+| [Authentication](https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-security-deployment)                     | :heavy_check_mark:       | :heavy_check_mark:      | :heavy_check_mark:      | :heavy_check_mark:*      | :heavy_check_mark:       | Connect your device to IoT Hub securely with supported authentication, including private key, SASToken, X-509 Self Signed over MQTT, AMQPS and HTTPS, and X-509 Certificate Authority (CA) Signed. *Currently, AMQPS_WS connections cannot use x509 authentication                                                     |
 | [Send device-to-cloud message](https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-messages-d2c)     | :heavy_check_mark:*      | :heavy_check_mark:*      | :heavy_check_mark:*      | :heavy_check_mark:*      | :heavy_check_mark:      | Send device-to-cloud messages (max 256KB) to IoT Hub with the option to add custom properties.  *IoT Hub supports batch send over AMQP and HTTPS at the moment, Java SDK only supports HTTPS. The MQTT and AMQP implementation loops over the batch and sends each message individually.                           |
 | [Receive cloud-to-device messages](https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-messages-c2d) | :heavy_check_mark:*      | :heavy_check_mark:*      | :heavy_check_mark:      | :heavy_check_mark:      | :heavy_check_mark:       | Receive cloud-to-device messages and read associated custom and system properties from IoT Hub, with the option to complete/reject/abandon C2D messages. *IoT Hub does not support option to reject/abandon C2D messages over MQTT at the moment. |
 | [Device Twins](https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-device-twins)                     | :heavy_check_mark: | :heavy_check_mark: |:heavy_check_mark: | :heavy_check_mark: | :heavy_minus_sign:       | IoT Hub persists a device twin for each device that you connect to IoT Hub.  The device can perform operations like get twin tags, subscribe to desired properties.                                                                                      |