Modify Jobs_UpdateMsg to support optional Expected version field

[priyamourya25]

Please refer the description of expected version for iot jobs:
https://docs.aws.amazon.com/iot/latest/apireference/API_iot-jobs-data_UpdateJobExecution.html#API_iot-jobs-data_UpdateJobExecution_RequestSyntax

This is an optional field and the user should be allowed to not pass and still construct a payload without the field. The API forces to provide an optional field here:

Jobs-for-AWS-IoT-embedded-sdk/source/jobs.c

Line 844 in 8be3560

if( ( expectedVersion != NULL ) && ( expectedVersionLength > 0U ) && ( bufferSize >=

Could you please modify the API so that it allows to append values only if they are passed by the user?

[rawalexe]

Hello Priya,
Thank you for pointing this out. Can you please make a PR with the change, we can quickly go over the changes and have it merged.

Best Regards,
AR

[kstribrnAmzn]

PR to add this feature - #104

[kstribrnAmzn]

PR is now merged. Closing