release: fixed the github action downloader

Changelog for v2.0.4

Updated the changelog for v2.0.3 release

Bump version to 2.0.2.

Update change log for 2.0.1, bump version number, and update copyrigh…

…t year.

Bring CHANGES.txt up to 2.0.0 version.

Backport build fixes.

raises() grows support for additional matchers on exception object.

Build fix - bump OSX job to python 3.7.

Release notes for 1.9.0