Adds a Date Parser

[burredis]

This PR adds a date parser that enables retrieval of a date with some enabled formats, such as DD/MM/YYYY.

Issue#4

[flavioltonon]

Valeu demais pela contribuição! Deixei alguns comentários, vê se fazem sentido!

[coveralls]

Pull Request Test Coverage Report for Build 11714301206

Details

• 80 of 86 (93.02%) changed or added relevant lines in 1 file are covered.
• 12 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+3.7%) to 70.047%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
date.go	80	86	93.02%

Files with Coverage Reduction	New Missed Lines	%
cnpj.go	2	95.6%
sus.go	10	77.78%

Totals
Change from base Build 11706206535:	3.7%
Covered Lines:	746
Relevant Lines:	1065

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💛 - Coveralls

[flavioltonon]

LGTM!