give users freedom to change hashing algorithm

[akamhy]

closes #17

[codecov]

Codecov Report

Merging #19 (29dbc75) into main (b04e7c2) will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   98.75%   98.93%   +0.18%     
==========================================
  Files           3        3              
  Lines          80       94      +14     
==========================================
+ Hits           79       93      +14     
  Misses          1        1              

Impacted Files	Coverage Δ
videohash/__version__.py	100.00% <100.00%> (ø)
videohash/vhash.py	98.79% <100.00%> (+0.24%)	⬆️

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