docs(release): update changelog for the 2024-01 release (#13401)

Author: scotthart

CHANGELOG.md

@@ -4,7 +4,7 @@
 breaking changes in the upcoming 3.x release. This release is scheduled for
 2024-12 or 2025-01.
 
-## v2.20.0 - TBD
+## v2.20.0 - 2024-01
 
 ### New Libraries
 
@@ -13,6 +13,29 @@ the APIs in these libraries are stable, and are ready for production use.
 
 - [Cloud Quotas](/google/cloud/cloudquotas/README.md)
 
+### [AI Platform/Vertex AI](/google/cloud/aiplatform/README.md)
+
+- feat(aiplatform): add new service proto file ([#13325](https://github.com/googleapis/google-cloud-cpp/pull/13325))
+
+### [Bigtable](/google/cloud/bigtable/README.md)
+
+- fix(bigtable): use FQDN ([#13305](https://github.com/googleapis/google-cloud-cpp/pull/13305))
+
+### [OpenTelemetry](/google/cloud/opentelemetry/README.md)
+
+- feat(otel): capture gRPC response metadata in traces ([#13278](https://github.com/googleapis/google-cloud-cpp/pull/13278))
+
+### [Pub/Sub](/google/cloud/pubsub/README.md)
+
+- fix(pubsub): get future value before returning ([#13241](https://github.com/googleapis/google-cloud-cpp/pull/13241))
+- fix(pubsub): pass by reference explicitly ([#13220](https://github.com/googleapis/google-cloud-cpp/pull/13220))
+
+### [Common Libraries](/google/cloud/README.md)
+
+- fix(common): returnable argument to `.then()` ([#13316](https://github.com/googleapis/google-cloud-cpp/pull/13316))
+- feat(common): read-write streaming RPCs metadata ([#13228](https://github.com/googleapis/google-cloud-cpp/pull/13228))
+- fix: respect logging format env var in `compute`, `sql` ([#13368](https://github.com/googleapis/google-cloud-cpp/pull/13368))
+
 ## v2.19.0 - 2023-12
 
 ### New Libraries

CMakeLists.txt

@@ -23,7 +23,7 @@ project(
     google-cloud-cpp
     VERSION 2.20.0
     LANGUAGES CXX)
-set(PROJECT_VERSION_PRE_RELEASE "rc")
+set(PROJECT_VERSION_PRE_RELEASE "")
 
 if (NOT "${PROJECT_VERSION_PRE_RELEASE}" STREQUAL "")
     set(PROJECT_VERSION "${PROJECT_VERSION}-${PROJECT_VERSION_PRE_RELEASE}")

google/cloud/internal/version_info.h

@@ -21,6 +21,6 @@
 #define GOOGLE_CLOUD_CPP_VERSION_MINOR 20
 // NOLINTNEXTLINE(modernize-macro-to-enum)
 #define GOOGLE_CLOUD_CPP_VERSION_PATCH 0
-#define GOOGLE_CLOUD_CPP_VERSION_PRE_RELEASE "rc"
+#define GOOGLE_CLOUD_CPP_VERSION_PRE_RELEASE ""
 
 #endif  // GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_INTERNAL_VERSION_INFO_H