all: Relase v0.35.1

Change-Id: Ib4f3454a9eeada7479bd5c58ec8046193a5b13d3
Reviewed-on: https://code-review.googlesource.com/c/37691
Reviewed-by: Jean de Klerk <deklerk@google.com>
Reviewed-by: kokoro <noreply+kokoro@google.com>
diff --git a/CHANGES.md b/CHANGES.md
index ac3e4d6..7f6688f 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,10 @@
 # Changes
 
+## 0.35.1
+
+- spanner:
+  - Adds OpenCensus views back to public API.
+
 ## v0.35.0
 
 - all: