all: add v0.37.1 release notes

This will be tagged v0.37.1.

Change-Id: I97831fcafb1e5de33b4a15876bfcc82504c5674a
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/38970
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Chris Broadfoot <cbro@google.com>
diff --git a/CHANGES.md b/CHANGES.md
index 1757407..341d269 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,10 @@
 # Changes
 
+## 0.37.1
+
+Small go.mod version bumps to bring in v0.2.0 of google.golang.org/api, which
+introduces a new oauth2 url.
+
 ## 0.37.0
 
 - spanner: