Sms API v1.0.10

To make sure that our APIs meet new regulations, we're adding two new fields to the send-sms endpoint. These are entity-id and content-id. The first of these regulations is DLT, which is an Indian regulation. For more information on DLT please go to: https://help.nexmo.com/hc/en-us/articles/204017423-India-Features-Restrictions .