Specifying an output file and a specific output format on the CLI is broken when multiple output formats are configured

[Callum027]

I'm using the latest version and have both Markdown and RST configured in my changelog/config.yml. I get the following error when specifying both --output and --output-format to generate release notes for a specific version to a custom file:

callum@callum-laptop:~/dev/github.com/Callum027/ansible-collection-palworld-dedicated-server$ antsibull-changelog generate 2.1.0 --only-latest --output RELEASENOTES.md --output-format md
When an explicit output path is specified and more than one output format is configured, you need to explicitly specify an output format

Looking at the relevant code, it appears to not take into account the --output-format argument value at all.

[felixfontein]

Oops! Thanks for reportig this!

[felixfontein]

#151 fixes this.