Add Scala 2.13 compilation target

[alonsodomin]

No description provided.

[alonsodomin]

Re-opening after wrong automatic merge happening in #141

[codecov]

Codecov Report

Merging #142 into master will increase coverage by 0.74%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #142      +/-   ##
=========================================
+ Coverage   90.66%   91.4%   +0.74%     
=========================================
  Files          60      69       +9     
  Lines        1050    1199     +149     
  Branches       44      45       +1     
=========================================
+ Hits          952    1096     +144     
- Misses         98     103       +5

Impacted Files	Coverage Δ
...core/shared/src/main/scala/cron4s/expr/nodes.scala	78.65% <0%> (-1.35%)	⬇️
...ain/scala/cron4s/testkit/CronDateTimeTestKit.scala	100% <0%> (ø)	⬆️
...c/main/scala/cron4s/validation/NodeValidator.scala	100% <0%> (ø)	⬆️
...main/scala/cron4s/testkit/gen/CronGenerators.scala	100% <0%> (ø)	⬆️
...e/shared/src/main/scala/cron4s/expr/CronExpr.scala	100% <0%> (ø)	⬆️
...dules/core/shared/src/main/scala/cron4s/Cron.scala	100% <0%> (ø)	⬆️
.../main/scala/cron4s/datetime/PredicateReducer.scala	100% <0%> (ø)	⬆️
.../cron4s/testkit/gen/ArbitraryCronFieldValues.scala	100% <0%> (ø)	⬆️
...main/scala/cron4s/testkit/discipline/package.scala	0% <0%> (ø)	⬆️
...shared/src/main/scala/cron4s/parsing/package.scala
... and 14 more

---

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[codecov]

Codecov Report

Merging #142 into master will decrease coverage by 10.26%.
The diff coverage is 75.86%.

@@             Coverage Diff             @@
##           master     #142       +/-   ##
===========================================
- Coverage   90.89%   80.63%   -10.27%     
===========================================
  Files          70       64        -6     
  Lines        1208     1172       -36     
  Branches       39       48        +9     
===========================================
- Hits         1098      945      -153     
- Misses        110      227      +117

Impacted Files	Coverage Δ
...ain/scala/cron4s/testkit/laws/IsDateTimeLaws.scala	100% <ø> (ø)
.../src/main/scala/cron4s/bench/ParserBenchmark.scala	0% <ø> (ø)
.../cron4s/testkit/discipline/DateTimeCronTests.scala	100% <ø> (ø)
.../main/scala/cron4s/testkit/IsDateTimeTestKit.scala	100% <ø> (ø)
...core/shared/src/main/scala/cron4s/expr/nodes.scala	80.3% <ø> (+1.65%)	⬆️
...la/cron4s/testkit/discipline/EnumeratedTests.scala	100% <ø> (ø)
...main/scala/cron4s/testkit/discipline/package.scala	0% <ø> (ø)
...main/scala/cron4s/testkit/gen/NodeGenerators.scala	96.55% <ø> (ø)
...ain/scala/cron4s/testkit/DateTimeCronTestKit.scala	100% <ø> (ø)
...core/shared/src/main/scala/cron4s/expr/parts.scala	0% <ø> (-33.34%)	⬇️
... and 34 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[pjfanning]

@alonsodomin would it be possible to use cats-core 2.0.0-M4 for scala 2.13.0 compile?

[alonsodomin]

@pjfanning yeah, of course, it will need to be versioned as a milestone too though.

However, this is blocked on a release of propensive/contextual; not sure if it was already released or not...

[alonsodomin]

Once the build passes, this closes #187

[alonsodomin]

Finally got a successful build in Scala 2.12, the Scala 2.13 build is failing due to a macro expansion error in the cron macro powered by contextual