Add changelog entry for v1.8.2 (#420)

Small bug fix release to fix the hard-coded timeout of requests
sessions.

Update Leo's affiliation in the Authors file (#397)

From Liverpool to São Paulo

Add changelog for v1.8.0 (#377)

Add changelog for version `v1.8.0` to `doc/changes.rst` and add link to
the docs of `v.1.8.0` in `doc/versions.rst`.

**Relevant issues/PRs:**

Related to #376

Add changelog for v1.7.0 (#347)

Add changelog for version v1.7.0 to `doc/changes.rst` and a new link to
documentation for v1.7.0 in `doc/versions.rst`.

Changelog entry for v1.6.0 (#297)

Includes a warning that this is the last release to support Python 3.6.

Changelog entry for v1.5.2 (#271)

Bug fix release with 1 bug fix, some maintenance, typo fixes, and minor
enhancements.

Changelog entry for v1.5.1 (#258)

Changelog entry for v1.5.0 (#249)

Strip tags from documentation page titles (#240)

The page titles included the `<span>` tags from the HTML title. Strip
the tags in the template to avoid this.

Add support and testing for Python 3.9 (#220)

Run tests on CI to verify that things work with the new release.