Less announcing, more change-logging

With version 2.5.0 we dropped creating special announcement documents and rely on communicating all relevant changes through the CHANGELOG. See at pypi for a rendered version of the last changes containing links to the important issues and pull requests that were integrated into the release.

The historic release announcements are still online here for various versions:

• 0.5,
• 1.0,
• 1.1,
• 1.2,
• 1.3,
• 1.4,
• 1.4.3,
• 1.8,
• 1.9,
• 2.0,
• 2.4.0.

Happy testing, The tox maintainers