update changelog and registered domain documentation

CHANGELOG.md

@@ -7,6 +7,12 @@
 FEATURES:
 
 - **New Data Source:** `dnsimple_registrant_change_check` (dnsimple/terraform-provider-dnsimple#155)
+- **Updated Resource:** `dnsimple_registered_domain` now supports the change of `contact_id` which results in domain contact change at the registry (dnsimple/terraform-provider-dnsimple#155)
+
+NOTES:
+
+The `contact_id` attribute previously only supported configuring at resource creation. Now the attribute can be changed and it will result in registrant change being initiated at the registrar. In addition the `extended_attributes` attribute can now also be updated after a domain has been registered and the values in the extended attributes will be passed along the registrant change as some TLDs require extended attributes to be passed along the registrant change.
+The registrant change can happen asynchronously for certain contact changes and TLDs. The resource supports this by attempting to sync the state of the registrant change in a similar way to how domain registration works with the `dnsimple_registered_domain` resource.
 
 ## 1.2.1
 

docs/resources/registered_domain.md

@@ -52,7 +52,7 @@ The following argument(s) are supported:
 * `dnssec_enabled` - (Optional) Whether the domain should have DNSSEC enabled (default: `false`)
 * `transfer_lock_enabled` - (Optional) Whether the domain transfer lock protection is enabled (default: `true`)
 * `premium_price` - (Optional) The premium price for the domain registration. This is only required if the domain is a premium domain. You can use our [Check domain API](https://developer.dnsimple.com/v2/registrar/#checkDomain) to check if a domain is premium. And [Retrieve domain prices API](https://developer.dnsimple.com/v2/registrar/#getDomainPrices) to retrieve the premium price for a domain.
-* `extended_attributes` - (Optional) A map of extended attributes to be set for the domain registration. To see if there are any required extended attributes for any TLD use our [Lists the TLD Extended Attributes API](https://developer.dnsimple.com/v2/tlds/#getTldExtendedAttributes).
+* `extended_attributes` - (Optional) A map of extended attributes to be set for the domain registration. To see if there are any required extended attributes for any TLD use our [Lists the TLD Extended Attributes API](https://developer.dnsimple.com/v2/tlds/#getTldExtendedAttributes). The values provided in the `extended_attributes` will also be sent when a registrant change is initiated as part of changing the `contact_id`.
 * `timeouts` - (Optional) (see [below for nested schema](#nestedblock--timeouts))
 
 # Attributes Reference