all: release v0.30.0

Change-Id: Ifbc397902f1aaa3bfd7f7cabe05985ba8f6c8bcc
Reviewed-on: https://code-review.googlesource.com/c/34130
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Eno Compton <enocom@google.com>
Reviewed-by: Jean de Klerk <deklerk@google.com>
diff --git a/CHANGES.md b/CHANGES.md
index e538471..a924b82 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,11 @@
 # Changes
 
+## v0.30.0
+
+- spanner: DML support added. See https://godoc.org/cloud.google.com/go/spanner#hdr-DML_and_Partitioned_DML for more information.
+- bigtable: bttest supports row sample filter.
+- functions: metadata package added for accessing Cloud Functions resource metadata.
+
 ## v0.29.0
 
 - bigtable: