feat(scheduler): allow standard and quartz spec

[wass3r]

❤ THANKS FOR HELPING OUT :D

Proposed change

Updates cron lib to newest version. This will now support both standard and quartz spec syntax for cron scheduling.

closes #20

Types of changes

What types of changes is this pull request introducing to flottbot? Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

You can fill this out after creating your PR. Put an x in the boxes that apply

• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[coveralls]

Pull Request Test Coverage Report for Build 281

• 0 of 24 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 37.701%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
remote/scheduler/remote.go	0	24	0.0%

Totals
Change from base Build 276:	-0.2%
Covered Lines:	820
Relevant Lines:	2175

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💛 - Coveralls

[JordanSussman]

minor typo