Use jd/map->Properties on kafka-streams opts

[madstap]

This seems like an oversight, I found it confusing that I had to use string keys.

Checklist

Not sure how to go about testing this?

• [ ] tests
• [x] updated CHANGELOG (the "unreleased" section)

[codecov[bot]]

Codecov Report

Merging #253 into master will increase coverage by 0.08%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #253      +/-   ##
==========================================
+ Coverage   81.16%   81.25%   +0.08%     
==========================================
  Files          41       41              
  Lines        2586     2560      -26     
  Branches      153      149       -4     
==========================================
- Hits         2099     2080      -19     
+ Misses        334      331       -3     
+ Partials      153      149       -4     

Impacted Files	Coverage Δ
src/jackdaw/streams.clj	82.92% <100.00%> (-0.28%)	:arrow_down:
src/jackdaw/test/commands/write.clj	92.85% <0.00%> (-0.33%)	:arrow_down:
src/jackdaw/test/serde.clj	94.52% <0.00%> (-0.08%)	:arrow_down:
src/jackdaw/test/transports/rest_proxy.clj	84.61% <0.00%> (-0.08%)	:arrow_down:
src/jackdaw/test/transports/kafka.clj	86.04% <0.00%> (+0.43%)	:arrow_up:
src/jackdaw/test/transports/mock.clj	84.48% <0.00%> (+2.73%)	:arrow_up:

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[cddr]

LGTM. The existing integration tests should cover this change.

e.g. this one which uses the kafka-streams function through the test fixture https://github.com/FundingCircle/jackdaw/blob/master/test/jackdaw/test/transports/kafka_test.clj#L54

[madstap]

Is there anything missing on my end for getting this PR merged?

[madstap]

I suppose this isn't really high priority, but the PR has seen it's first birthday already. Any hope of getting it merged?