Add contact IDs to schema
Add contact IDs to schema

To create a Pingdom check with email alerts set up you have to
provide a list of contact IDs of email recipients.

This will allow you to set the `contactids` field in a `pingdom_check`
resource. The field takes a list of contact IDs as integers. The
contact IDs are then provided when creating a Pingdom check[1].

[1] https://www.pingdom.com/resources/api#MethodCreate+New+Check

russellcardullo/terraform-provider-pingdom,russellcardullo/terraform-provider-pingdom