azure-iot-sdk-c: Bump to version 2018-03-16

Signed-off-by: André Hentschel <nerv@dawncrow.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/azure-iot-sdk-c/azure-iot-sdk-c.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-AZURE_IOT_SDK_C_VERSION = 2017-06-30
+AZURE_IOT_SDK_C_VERSION = 2018-03-16
 AZURE_IOT_SDK_C_SITE = https://github.com/Azure/azure-iot-sdk-c
 AZURE_IOT_SDK_C_SITE_METHOD = git
 AZURE_IOT_SDK_C_GIT_SUBMODULES = YES