Update CHANGELOG.md.

Author: omazin

CHANGELOG.md

@@ -9,11 +9,11 @@ project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Removed
 
-- Removed variable `peering_completed`. [#77]
+- Removed variable `peering_completed`. [#78]
 
 ### Added
 
-- Added variable `module_depends_on`. [#77]
+- Added variable `module_depends_on`. [#78]
 
 ## [2.0.0] - 2019-09-26
 
@@ -60,4 +60,4 @@ project adheres to [Semantic Versioning](http://semver.org/).
 [#56]: https://github.com/terraform-google-modules/terraform-google-sql-db/pull/56
 [#53]: https://github.com/terraform-google-modules/terraform-google-sql-db/pull/53
 [#43]: https://github.com/terraform-google-modules/terraform-google-sql-db/pull/43
-[#77]: https://github.com/terraform-google-modules/terraform-google-sql-db/pull/77
+[#78]: https://github.com/terraform-google-modules/terraform-google-sql-db/pull/78