Make status' id a Long

[BenFradet]

cc @mscharley

[codecov-io]

Codecov Report

Merging #183 into master will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #183      +/-   ##
==========================================
- Coverage   87.11%   86.95%   -0.17%     
==========================================
  Files          42       42              
  Lines         621      621              
  Branches        5        5              
==========================================
- Hits          541      540       -1     
- Misses         80       81       +1

Impacted Files	Coverage Δ
...c/main/scala/github4s/free/domain/Repository.scala	100% <ø> (ø)	⬆️
.../jvm/src/main/scala/github4s/util/URLEncoder.scala	0% <0%> (-100%)	⬇️

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[juanpedromoreno]

LGTM, thanks!