Change to make fs2.kafka.Id public

[vlovgr]

Fixes #86.

[codecov]

Codecov Report

Merging #87 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #87   +/-   ##
=======================================
  Coverage   98.34%   98.34%           
=======================================
  Files          34       34           
  Lines         727      727           
  Branches       56       56           
=======================================
  Hits          715      715           
  Misses         12       12

Impacted Files	Coverage Δ
src/main/scala/fs2/kafka/package.scala	100% <ø> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 045db81...4615360. Read the comment docs.