test: fix global state pollution in TestFormatMessage

TestFormatMessage sets the package-level outputFormat to hex but
never restores it. When TestProduceConsume runs afterward, consume
still uses hex format, producing "7468697320697320612074657374"
instead of "this is a test".

Add defer to restore outputFormat after each subtest.

goreleaser: add homepage / upstream

goreleaser: add upstream to aur

fix goreleaser

fix goreleaser

Merge pull request #341 from jackcipher/master

Improve lag calculation and error handling in lagCmd

Merge pull request #313 from Dawnflash/msk-iam

Add support for the AWS_MSK_IAM SASL mechanism

switch to IBM/sarama

goreleaser: fix archive name

goreleaser: include version

Fixes #268