Goth

Features
- added optional `extra_monitors` parameter to `Runnercheck_assertion_errors` [495](https://github.com/golemfactory/goth/pull/495)
- added the `--unstable` option to release downloader script [500](https://github.com/golemfactory/goth/pull/500)

Bugfixes
- fixed reporting of assertion success and failure in `EventMonitor` [495](https://github.com/golemfactory/goth/pull/495)

Other changes
- changed the `yagna` Docker image builder to use stable releases by default [500](https://github.com/golemfactory/goth/pull/500)

Other changes
- added CHANGELOG.md and CONTRIBUTING.md files [487](https://github.com/golemfactory/goth/pull/487)
- updated default goth assets [490](https://github.com/golemfactory/goth/pull/490)

Features
- enabled overriding values when parsing `goth-config.yml` file [489](https://github.com/golemfactory/goth/pull/489)

Bugfixes
- resolved issues with running external commands as part of a `goth` test [485](https://github.com/golemfactory/goth/pull/485)
- fixed receiving proposals from providers in `yagna 0.6.4-rc3` and up [486](https://github.com/golemfactory/goth/pull/486)

Other changes
- added `yagna` payment driver CLI integration test [453](https://github.com/golemfactory/goth/pull/453), [#479](https://github.com/golemfactory/goth/pull/479)
- added Actions workflow step which makes sure Docker network gets cleaned up properly [481](https://github.com/golemfactory/goth/pull/481)

Bugfixes
- fixed `mitmproxy` thread not being stopped properly [476](https://github.com/golemfactory/goth/pull/476)

Features
- added optional, explicit name field to `Assertion` [469](https://github.com/golemfactory/goth/pull/469)
- updated GitHub assets downloaders to use [`ghapi`](https://ghapi.fast.ai/core.html) [#455](https://github.com/golemfactory/goth/pull/455)

Other changes
- added colours to various log messages from `goth` [478](https://github.com/golemfactory/goth/pull/478)
- added Docker cleanup step to GitHub Actions test workflow [475](https://github.com/golemfactory/goth/pull/475)
- updated project dependencies [472](https://github.com/golemfactory/goth/pull/472)