all: release v0.8.0

This includes the x-goog-api-client fix https://github.com/googleapis/google-api-go-client/commit/26394839807bbc7d7a34942eb43bf1241bd22a8f.

Change-Id: Iba26b06966b08bca32bcb20f44c7746844b3043c
Reviewed-on: https://code-review.googlesource.com/c/google-api-go-client/+/43770
Reviewed-by: Jean de Klerk <deklerk@google.com>
diff --git a/CHANGES.md b/CHANGES.md
index 4244193..416a8b7 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,10 @@
+# v0.8.0
+
+- Various updates to autogenerated clients.
+
+_Please note:_ the release version is not indicative of an individual client's
+stability or version.
+
 # v0.7.0
 
 - Various updates to autogenerated clients.