remove self.now from freshness_date_parser

[noviluni]

Removes the self.now from the freshness_date_parser to make it more compatible with concurrency/threads (partial fix).

closes: #814
simplifies: #834 (as it can't be merged as-is)

fixes partially: #813, #441

[codecov]

Codecov Report

Merging #885 (699ada7) into master (be05e0e) will decrease coverage by 0.00%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master     #885      +/-   ##
==========================================
- Coverage   98.20%   98.20%   -0.01%     
==========================================
  Files         229      229              
  Lines        2504     2501       -3     
==========================================
- Hits         2459     2456       -3     
  Misses         45       45              

Impacted Files	Coverage Δ
dateparser/freshness_date_parser.py	99.01% <94.44%> (-0.03%)	⬇️

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[ageorge95]

That fixed my problem of using threading and dateparser.
Thanks @noviluni 👍