Add PR number to CHANGELOG.

Author: kpfleming

CHANGELOG.md

@@ -6,7 +6,7 @@
 
 - feat(domains/v1): add `description` field ([#1002](https://github.com/fastly/terraform-provider-fastly/pull/1002))
 - feat(backend): Add support for 'prefer IPv6' attribute. ([#1003](https://github.com/fastly/terraform-provider-fastly/pull/1003))
-- feat(logging): Add support for 'processing region' attribute. ([#10](https://github.com/fastly/terraform-provider-fastly/pull/10))
+- feat(logging): Add support for 'processing region' attribute. ([#1011](https://github.com/fastly/terraform-provider-fastly/pull/1011))
 
 ### BUG FIXES:
 - fix(block_fastly_service_settings): fix detection of falsey value for stale_if_error field ([#1003](https://github.com/fastly/terraform-provider-fastly/pull/1009))