chore: release 0.5.1 (googleapis#131)

* updated CHANGELOG.md [ci skip]

* updated setup.cfg [ci skip]

* updated setup.py

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

chore: release v0.5.0 (googleapis#111)

Release v0.4.1 (googleapis#104)

Release google-resumable-media 0.4.0. (googleapis#101)

Release v0.3.3 (googleapis#91)

Release 0.3.2 (googleapis#53)

* Release 0.3.2

Adding 0.3.1 version docs.

Adding 0.3.0 version docs.

Adding `0.2.3` docs after 0.2.3.

Swap the order of _write_to_stream() / _process_response() in `reques…

…ts` download.