spanner: release v1.4.0

Change-Id: Icb25f68a52e528f58bdc09c3432f57982775e90e
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/53530
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Shanika Kuruppu <skuruppu@google.com>
diff --git a/internal/version/version.go b/internal/version/version.go
index 4a60935..de06d1f 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 = "20200316"
+const Repo = "20200319"
 
 // Go returns the Go runtime version. The returned string
 // has no whitespace.
diff --git a/spanner/CHANGES.md b/spanner/CHANGES.md
index b785fb7..31b81a4 100644
--- a/spanner/CHANGES.md
+++ b/spanner/CHANGES.md
@@ -1,5 +1,15 @@
 # Changes
 
+## v1.4.0
+
+- Support managed backups. This includes the API methods for CreateBackup,
+  GetBackup, UpdateBackup, DeleteBackup and others. Also includes a simple
+  wrapper in DatabaseAdminClient to create a backup.
+- Update the healthcheck interval. The default interval is updated to 50 mins.
+  By default, the first healthcheck is scheduled between 10 and 55 mins and
+  the subsequent healthchecks are between 45 and 55 mins. This update avoids
+  overloading the backend service with frequent healthchecking.
+
 ## v1.3.0
 
 * Query options: