Upgrade to Kafka 2.4.1

[csenol]

Checklist

• tests
• updated CHANGELOG (the "unreleased" section)

[codecov]

Codecov Report

Merging #270 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #270   +/-   ##
=======================================
  Coverage   81.16%   81.16%           
=======================================
  Files          41       41           
  Lines        2586     2586           
  Branches      153      153           
=======================================
  Hits         2099     2099           
  Misses        334      334           
  Partials      153      153           

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[csenol]

Kafka 2.4 is providing new partition assignment strategies such as cooperative-sticky
It would be good if jackdaw can catch-up

[cddr]

Might be worth also updating the images used by CI to the corresponding confluent release.

https://github.com/FundingCircle/jackdaw/blob/master/.circleci/config.yml#L44

[cddr]

lgtm

[csenol]

Thanks for the review.
When are you planning to have a release?

[cddr]

I'm no longer an administrator so dunno when someone will be able to get a release out. If you have a pressing need though, you may be able to just override the kafka dependencies in your own project.clj.

[mt3593]

Any update on this, any administrators able to get a release out?

[robert-pierce]

Following ... we could use the new support for Named class. We are producing graph images of our topologies as a method of documentation, and naming the nodes would be extremely helpful.

[dakra]

fyi, I have merged a few PRs that I needed (including this one) in my fork.
I also published it to clojars.

I don't really want to maintain this fork or make something official
or anything. I just did it because I needed it personally, maybe it
helps you too until @FundingCircle picks development up again.

[gphilipp]

Closing since we upgraded to 2.8.0 via #292