Fix publishing settings after the removal of sbt-modules

[sbrunk]

Seems like I screwed up few settings that are important for publishing when I had to remove sbt-modules in #166. Sorry about that. These changes should bring back the previous state.

[codecov]

Codecov Report

Merging #173 into master will increase coverage by 0.71%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
+ Coverage   95.68%   96.40%   +0.71%     
==========================================
  Files          10       10              
  Lines         139      139              
  Branches        2        2              
==========================================
+ Hits          133      134       +1     
+ Misses          6        5       -1     

Impacted Files	Coverage Δ
...ysevendeg/scalacheck/datetime/instances/joda.scala	100.00% <ø> (ø)
...rtysevendeg/scalacheck/datetime/joda/GenJoda.scala	94.44% <ø> (ø)
...scalacheck/datetime/joda/granularity/package.scala	100.00% <ø> (ø)
...ala/com/fortysevendeg/scalacheck/magic/Magic.scala	100.00% <ø> (ø)
...ortysevendeg/scalacheck/datetime/GenDateTime.scala	100.00% <0.00%> (+20.00%)	⬆️

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[BenFradet]

Thanks 👍