Got a random test failure in Travis for Scala 2.12

[fedefernandez]

Log message:

[info] ! Java 8 Generators.arbitrary generation with a granularity generates appropriate ZonedDateTimes: Falsified after 58167 passed tests.
[info] > Labels of failing property: 
[info] Hours: +45746443-09-27T04:00+13:45[NZ-CHAT]
[info] > ARG_0: (com.fortysevendeg.scalacheck.datetime.jdk8.granularity.package$$anon$3@2c86bf85,com.fortysevendeg.scalacheck.datetime.jdk8.GenJdk8Properties$$$Lambda$2144/1142872265@35fcbed8)
[info] > ARG_1: +45746443-09-27T04:00+13:45[NZ-CHAT]

[raulraja]

Also seen here https://travis-ci.org/47deg/scalacheck-toolbox/jobs/268091917#L1680 in #56

[fedefernandez]

Also in #67

[info] ! Java 8 Generators.genZonedDateTime with a granularity generates appropriate ZonedDateTimes: Falsified after 13487 passed tests.
[info] > Labels of failing property: 
[info] Hours: +171884780-09-28T04:00+13:45[NZ-CHAT]
[info] > ARG_0: (com.fortysevendeg.scalacheck.datetime.jdk8.granularity.package$$anon$3@4ecbac6a,com.fortysevendeg.scalacheck.datetime.jdk8.GenJdk8Properties$$$Lambda$7798/1684101346@3db07e15)
[info] > ARG_1: +171884780-09-28T04:00+13:45[NZ-CHAT]

[jisantuc]

Also in #315 (with other failures in other tests in that suite)