Release 0.31.0 (googleapis#4903)

Release 1.5.0 (googleapis#4901)

Release dlp-0.1.0 (googleapis#4884)

Release datastore-1.5.0 (googleapis#4883)

Bump Speech version to 0.32.0 (googleapis#4865)

Also add documentation for v1p1beta1.

Fix bad version number for speech

Release BigQuery 0.30.0 (googleapis#4853)

Preparing release 0.18.0 of trace (googleapis#4831)

Release Spanner 1.0.0 (googleapis#4846)

Vision updates. (googleapis#4811)

  * Updated autogen surface.
  * New web detection features: title, full matching images, partial matching images, visually similar images, best guess labels.