all: release v0.7.0

This commit will be tagged v0.7.0.

Change-Id: Ib89bf1444c87d3d0d9454ca89ffe139dd7252115
Reviewed-on: https://code-review.googlesource.com/c/google-api-go-client/+/42210
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jean de Klerk <deklerk@google.com>

Author: shollyman

CHANGES.md

@@ -1,3 +1,10 @@
+# v0.7.0
+
+- Various updates to autogenerated clients.
+
+_Please note:_ the release version is not indicative of an individual client's
+stability or version.
+
 # v0.6.0
 
 - Add support for GCP DirectPath.