Fix date parsing return from README and docs usage page

[lucasdutraf]

fixes #617

[codecov]

Codecov Report

Merging #619 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #619   +/-   ##
======================================
  Coverage    95.2%   95.2%           
======================================
  Files         302     302           
  Lines        2502    2502           
======================================
  Hits         2382    2382           
  Misses        120     120

Impacted Files	Coverage Δ
dateparser/freshness_date_parser.py	98.94% <0%> (ø)	⬆️

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[buriy]

Have you checked the code works properly and only docs needs to be addressed?

[noviluni]

Hi @lucasdutraf ! Thank you for the fix! 🎉

@buriy yes, it was a typo, it works in this way.

[Gallaecio]

Thanks!