Cut release of vision API.

[dhermes]

Also bumping the version on the uber-package.

[dhermes]

I'm starting release notes from:

$ git log vision-0.25.0..HEAD --pretty=%H -- vision/
987dc826fe1ff16e4b3f06909ae9d9870a2faba2
14e570a3f435f8904ed9fa52d545a35ba5868ad1
3d9461b91963fcc6e6a864f6f0eacad3d92bbf2d
da3a7bbe8c7770540c2149fabfc6f74db89f7ce4
bc7b0fdb9fd99b2c86de9830a25cfaaa295b1c45
b9cb6d17236528ddce982c3e802af3221de80880
39feb3e23d451963ca31b383d8b395afcf7ab817
8ab1afec399b51a1114b7dc223cd2b4e386a3314

[dhermes]

Not in release:

• This PR: 987dc82
• PyPI links change: 14e570a
• Author change in setup.py: da3a7bb
• nox change: bc7b0fd
• nox change: b9cb6d1
• LICENSE header change: 39feb3e

Release notes:

• Fixing broken links after docs rename (Fixing references to "dead" docs links. #3631)
• Add the ability to specify AnnotateImageRequest items in single-feature methods. (Add the ability to specify AnnotateImageRequest items in single-feature methods. #3554)

[dhermes]

After @lukesneeringer and I realized https://github.com/GoogleCloudPlatform/google-cloud-python/releases/tag/vision-0.25.0 contained #3373, this has been downgraded to a micro release.

[tseaver]

LGTM

[dhermes]

• Tag Build: https://circleci.com/gh/GoogleCloudPlatform/google-cloud-python/2591
• Release: https://github.com/GoogleCloudPlatform/google-cloud-python/releases/tag/vision-0.25.1

[dhermes]

The build failed (I filed #3681) so I had to manually push to PyPI, but release is done: https://pypi.org/project/google-cloud-vision/0.25.1/