remove convert_to_local_tz

[noviluni]

This function is not used, is not documented, it's not tested and there isn't any reference anywhere (https://github.com/scrapinghub/dateparser/search?q=convert_to_local_tz).

However removing it directly could be considered as a breaking change.

[codecov]

Codecov Report

Merging #847 (8329713) into master (6fb6e37) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #847      +/-   ##
==========================================
+ Coverage   98.37%   98.41%   +0.03%     
==========================================
  Files         231      231              
  Lines        2591     2589       -2     
==========================================
- Hits         2549     2548       -1     
+ Misses         42       41       -1     

Impacted Files	Coverage Δ
dateparser/timezone_parser.py	100.00% <ø> (+1.78%)	⬆️

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[Gallaecio]

Time for a 2.0 milestone? 🙂