Validate Period date ranges

[fmrsabino]

• Validates that the date ranges are valid – the start_date must be on the same day or before end_date.

[coveralls]

Pull Request Test Coverage Report for Build 9171006346

Details

• 20 of 20 (100.0%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 90.393%

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Files with Coverage Reduction	New Missed Lines	%
safe_locking_service/campaigns/models.py	1	96.92%

Totals
Change from base Build 9170529126:	0.04%
Covered Lines:	1769
Relevant Lines:	1957

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💛 - Coveralls

[moisses89]

Maybe we can overwrite the Period.save() to call the validation function, what do you think?

[fmrsabino]

Done here 76b0cb0