na: 0.27.0 release

Fixes #1123

Change-Id: Ib90ad50ea4b5dc601de308a49b9de15560febf14
Reviewed-on: https://code-review.googlesource.com/32290
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
diff --git a/CHANGES.md b/CHANGES.md
index 34befef..d2ad079 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,20 @@
 # Changes
 
+## v0.27.0
+
+- bigquery:
+  - Allow modification of encryption configuration and partitioning options to a table via the Update call.
+  - Add a SchemaFromJSON function that converts a JSON table schema.
+- bigtable:
+  - Restore cbt count functionality.
+- containeranalysis:
+  - Add v1beta client.
+- spanner:
+  - Fix a case where an iterator might not be closed correctly.
+- storage:
+  - Add ServiceAccount method https://godoc.org/cloud.google.com/go/storage#Client.ServiceAccount.
+  - Add a method to Reader that returns the parsed value of the Last-Modified header.
+
 ## v0.26.0
 
 - bigquery: