Adapt CronLine spec to explict @timezone, gh-220
Adapt CronLine spec to explict @timezone, gh-220

Beforehand, the local timezone in the CronLine was stored as `nil`, from gh-220 on, it is stored as a TZInfo::Timezone (like CronLine with non-local timezones).

jmettraux/rufus-scheduler,kssminus/rufus-scheduler