remove python2/unicode references

[noviluni]

for: #727

[codecov]

Codecov Report

Merging #783 into master will decrease coverage by 2.79%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #783      +/-   ##
==========================================
- Coverage   98.37%   95.57%   -2.80%     
==========================================
  Files         231      304      +73     
  Lines        2523     2599      +76     
==========================================
+ Hits         2482     2484       +2     
- Misses         41      115      +74     

Impacted Files	Coverage Δ
dateparser/__init__.py	100.00% <ø> (ø)
dateparser/calendars/__init__.py	95.45% <ø> (ø)
dateparser/languages/dictionary.py	99.32% <ø> (ø)
dateparser/languages/loader.py	100.00% <ø> (ø)
dateparser/languages/locale.py	98.64% <ø> (ø)
dateparser/search/__init__.py	100.00% <ø> (ø)
dateparser/search/search.py	99.33% <ø> (ø)
dateparser/date.py	99.57% <100.00%> (ø)
dateparser/search/detection.py	94.33% <0.00%> (-1.58%)	⬇️
dateparser/utils/__init__.py	97.41% <0.00%> (ø)
... and 73 more

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