update SDK version

Author: yougaliu

src/sdk-impl/qcloud_iot_export.h

@@ -24,7 +24,7 @@ extern "C" {
 #define QCLOUD_IOT_DEVICE_SDK_APPID                                	"21010406"
 
 /* IoT C-SDK version info */
-#define QCLOUD_IOT_DEVICE_SDK_VERSION                               "3.0.1"
+#define QCLOUD_IOT_DEVICE_SDK_VERSION                               "3.0.2"
 
 /* MQTT心跳消息发送周期, 单位:ms */
 #define QCLOUD_IOT_MQTT_KEEP_ALIVE_INTERNAL                         (240 * 1000)