Update version, changelog

Since the bugfix introduced in #19 didn't include any update to the version and changelog, I'm doing this here.
This is great. I wonder if we should:

- add a 'Bug fixes:' header, like [this](https://github.com/gds-operations/vcloud-tools-tester/blame/semver-changelog/CHANGELOG.md#L50).

- could the CHANGELOG message relate better to the user? It feels very technical at the moment, which is fine, but as a casual user I'm not sure I'd understand what the impact of this bug and its fix have on me.