chore: release 0.78.0 (#3709)

diff --git a/CHANGES.md b/CHANGES.md
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@@ -1,6 +1,25 @@
 # Changes
 
 
+## [0.78.0](https://www.github.com/googleapis/google-cloud-go/compare/v0.77.0...v0.78.0) (2021-02-22)
+
+
+### Features
+
+* **area120/tables:** Added ListWorkspaces, GetWorkspace, BatchDeleteRows APIs. ([16597fa](https://www.github.com/googleapis/google-cloud-go/commit/16597fa1ce549053c7183e8456e23f554a5501de))
+* **area120/tables:** Added ListWorkspaces, GetWorkspace, BatchDeleteRows APIs. ([0bd21d7](https://www.github.com/googleapis/google-cloud-go/commit/0bd21d793f75924e5a2d033c58e8aaef89cf8113))
+* **dialogflow:** add additional_bindings to Dialogflow v2 ListIntents API docs: update copyrights and session docs ([0bd21d7](https://www.github.com/googleapis/google-cloud-go/commit/0bd21d793f75924e5a2d033c58e8aaef89cf8113))
+* **documentai:** Update documentai/v1beta3 protos ([613ced7](https://www.github.com/googleapis/google-cloud-go/commit/613ced702bbc82a154a4d3641b483f71c7cd1af4))
+* **gkehub:** Update Membership API v1beta1 proto ([613ced7](https://www.github.com/googleapis/google-cloud-go/commit/613ced702bbc82a154a4d3641b483f71c7cd1af4))
+* **servicecontrol:** Update the ruby_cloud_gapic_library rules for the libraries published to google-cloud-ruby to the form that works with build_gen (separate parameters for ruby_cloud_title and ruby_cloud_description). chore: Update Bazel-Ruby rules version. chore: Update build_gen version. ([0bd21d7](https://www.github.com/googleapis/google-cloud-go/commit/0bd21d793f75924e5a2d033c58e8aaef89cf8113))
+* **speech:** Support Model Adaptation. ([0bd21d7](https://www.github.com/googleapis/google-cloud-go/commit/0bd21d793f75924e5a2d033c58e8aaef89cf8113))
+
+
+### Bug Fixes
+
+* **dialogflow/cx:** RunTestCase http template. PHP REST client lib can be generated. feat: Support transition route group coverage for Test Cases. ([613ced7](https://www.github.com/googleapis/google-cloud-go/commit/613ced702bbc82a154a4d3641b483f71c7cd1af4))
+* **errorreporting:** Fixes ruby gem build ([0bd21d7](https://www.github.com/googleapis/google-cloud-go/commit/0bd21d793f75924e5a2d033c58e8aaef89cf8113))
+
 ## [0.77.0](https://www.github.com/googleapis/google-cloud-go/compare/v0.76.0...v0.77.0) (2021-02-16)