Bump rufus-scheduler from 3.4.2 to 3.6.0

[dependabot-preview]

Bumps rufus-scheduler from 3.4.2 to 3.6.0.

Changelog

Sourced from rufus-scheduler's changelog.

rufus-scheduler 3.6.0 - released 2019-04-22

• Let Scheduler#cron fail if the cron string is invalid, gh-289
• Implement Job#next_times(count) for cron, every, and interval jobs
• Implement Job#next_times(count) for at and in jobs
• Stop fooling around and stick to https://semver.org

rufus-scheduler 3.5.2 - released 2018-08-01

• Use Fugit::Cron#rough_frequency
• Improve Job#check_frequency performance, gh-276, @​drcapulet

rufus-scheduler 3.5.1 - released 2018-07-20

• Upgrade fugit to 1.1.4 (with out of DST issue fix)
• Ensure JRuby doesn't count fresh, new, work threads as vacant

rufus-scheduler 3.5.0 - released 2018-05-15

• Use fugit to parse durations
• Drop .parse_time_string and .parse_duration_string
• Use fugit to parse cronlines

Commits

• db3b559 Release 3.6.0
• a501a16 Prepare 3.6.0 [ci skip]
• e5e3616 Fail Scheduler#cron if cron string invalid, gh-289
• cf7fcc5 Refine @​dwaxe readme update, gh-288
• af03d7b Merge pull request #288 from dwaxe/patch-1
• 40c747c Update README for test env
• d4919cd Add Mike to credits file
• 6b9074e Merge pull request #287 from mike-yesware/update-rubies
• 5805065 Update mainline ruby test targets
• e876365 Point readme to gitter chat room [ci skip]
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #114.