fix/do not discard spans in postag

[NeonJarbas]

for consistency also use spans in postag

follow up to #52

[codecov]

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@@          Coverage Diff          @@
##             dev     #53   +/-   ##
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  Coverage       ?   0.00%           
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  Files          ?      36           
  Lines          ?    2215           
  Branches       ?       0           
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  Hits           ?       0           
  Misses         ?    2215           
  Partials       ?       0           

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