chore: release spanner 1.22.0 (#4339)

* chore: release spanner 1.22.0

* Update CHANGES.md

Co-authored-by: Hengfeng Li <hengfeng@google.com>
diff --git a/spanner/CHANGES.md b/spanner/CHANGES.md
index c94a9da..7e8c701 100644
--- a/spanner/CHANGES.md
+++ b/spanner/CHANGES.md
@@ -1,5 +1,13 @@
 # Changes
 
+## [1.22.0](https://www.github.com/googleapis/google-cloud-go/compare/spanner/v1.21.0...spanner/v1.22.0) (2021-06-30)
+
+
+### Features
+
+* **spanner:** support request and transaction tags ([#4336](https://www.github.com/googleapis/google-cloud-go/issues/4336)) ([f08c73a](https://www.github.com/googleapis/google-cloud-go/commit/f08c73a75e2d2a8b9a0b184179346cb97c82e9e5))
+* **spanner:** enable request options for batch read ([#4337](https://www.github.com/googleapis/google-cloud-go/issues/4337)) ([b9081c3](https://www.github.com/googleapis/google-cloud-go/commit/b9081c36ed6495a67f8e458ad884bdb8da5b7fbc))
+
 ## [1.21.0](https://www.github.com/googleapis/google-cloud-go/compare/spanner/v1.20.0...spanner/v1.21.0) (2021-06-23)