0.4.0

This is a comparatively small release that has two notable kcl-focused changes: AWS_MSK_IAM now exists loads credentials from your ~/.aws/credentials file, so you do not need to duplicate credentials into a kcl config, and the topic and group admin subcommands are now also top level kcl subcommands. I figured that I used topic/group so much that having them not be gated behind admin was quite convenient.

This also updates the franz-go library from v0.7.3 to v0.8.3, which contains numerous fixes. Most of the bugs would not be noticeable within kcl itself, though. For more details on the franz-go library changes, see its changelog.