Upgrade to Scala 2.12.2 and 2.11.11

[alonsodomin]

... plus some other dependency upgrades...

[codecov-io]

Codecov Report

Merging #78 into master will decrease coverage by 0.77%.
The diff coverage is 46.87%.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
- Coverage   92.53%   91.76%   -0.78%     
==========================================
  Files          62       62              
  Lines         951      971      +20     
  Branches       39       41       +2     
==========================================
+ Hits          880      891      +11     
- Misses         71       80       +9

Impacted Files	Coverage Δ
...ala/cron4s/lib/javatime/JavaTemporalInstance.scala	85.18% <ø> (ø)	⬆️
...ared/src/main/scala/cron4s/syntax/enumerated.scala	100% <ø> (ø)	⬆️
.../cron4s/testkit/discipline/DateTimeNodeTests.scala	100% <ø> (ø)	⬆️
core/shared/src/main/scala/cron4s/CronUnit.scala	100% <ø> (ø)	⬆️
.../shared/src/main/scala/cron4s/validation/ops.scala	100% <ø> (ø)	⬆️
...red/src/main/scala/cron4s/validation/package.scala	85.71% <ø> (+5.71%)	⬆️
core/shared/src/main/scala/cron4s/Cron.scala	100% <100%> (ø)	⬆️
.../shared/src/main/scala/cron4s/parser/package.scala	100% <100%> (ø)	⬆️
...main/scala/cron4s/testkit/gen/NodeGenerators.scala	100% <100%> (ø)	⬆️
...e/shared/src/main/scala/cron4s/expr/wrappers.scala	55.31% <16.66%> (+3.23%)	⬆️
... and 1 more

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