Fix when first token is SPACE

[sammous]

Fixing issue (#22 ) of not having Lefff lemma/POS when the first token is SPACE.

[codecov]

Codecov Report

Merging #23 into master will increase coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage   78.86%   79.02%   +0.15%     
==========================================
  Files           4        4              
  Lines         530      534       +4     
  Branches      106      107       +1     
==========================================
+ Hits          418      422       +4     
  Misses         84       84              
  Partials       28       28

Impacted Files	Coverage Δ
spacy_lefff/lefff.py	96% <100%> (+0.34%)	⬆️

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