all: release v0.56.0

Change-Id: If843e2a94ed8f89119e2970c830ab7d09292c251
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/54070
Reviewed-by: Alex Hong <hongalex@google.com>
Reviewed-by: Cody Oss <codyoss@google.com>
diff --git a/CHANGES.md b/CHANGES.md
index 8c0d7d5..52e67d6 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,24 @@
 # Changes
 
+## v0.56.0
+
+- secretmanager:
+  - add IAM helper
+- profiler:
+  - try all us-west1 zones for integration tests
+- internal:
+  - add config to generate webrisk v1
+  - add repo and commit to buildcop invocation
+  - add recaptchaenterprise v1 generation config
+  - update microgenerator to v0.12.5
+  - add datacatalog client
+  - start generating security center settings v1beta
+  - start generating osconfig agentendpoint v1
+  - setup generation for bigquery/connection/v1beta1
+- all:
+  - increase continous testing timeout to 45m
+  - various updates to autogenerated clients.
+
 ## v0.55.0
 
 - Various updates to autogenerated clients.
diff --git a/internal/version/version.go b/internal/version/version.go
index de06d1f..5e06a3e 100644
--- a/internal/version/version.go
+++ b/internal/version/version.go
@@ -26,7 +26,7 @@
 
 // Repo is the current version of the client libraries in this
 // repo. It should be a date in YYYYMMDD format.
-const Repo = "20200319"
+const Repo = "20200331"
 
 // Go returns the Go runtime version. The returned string
 // has no whitespace.