storage: release v1.6.0

This commit will be tagged storage/v1.6.0

Change-Id: I4eb22c0cbd9b8ba9672098ca26b121e5cec2355c
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/52413
Reviewed-by: Chris Cotter <cjcotter@google.com>
diff --git a/storage/CHANGES.md b/storage/CHANGES.md
index 6b570f7..00fa1c1 100644
--- a/storage/CHANGES.md
+++ b/storage/CHANGES.md
@@ -1,5 +1,11 @@
 # Changes
 
+## v1.6.0
+
+- Updated option handling:
+  - Don't drop custom scopes (#1756)
+  - Don't drop port in provided endpoint (#1737)
+
 ## v1.5.0
 
 - Honor WithEndpoint client option for reads as well as writes.