Feature/pluralize

[rolandmueller]

Add a new module for a PLURALIZE tag
For a noun or a list of nouns, it will match any singular or plural word.
Usage for a single word, e.g.:

PLURALIZE("car")

Usage for lists, e.g.:

vehicles = {"car", "bicycle", "ship"}
PLURALIZE(vehicles)

Will work even for regex or if the lemmatizer of spaCy is making an error.
Has dependency to the Python inflect package https://pypi.org/project/inflect/

[codecov]

Codecov Report

Merging #82 into master will decrease coverage by 0.57%.
The diff coverage is 73.68%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
- Coverage   93.36%   92.79%   -0.58%     
==========================================
  Files          12       13       +1     
  Lines         648      666      +18     
  Branches      112      115       +3     
==========================================
+ Hits          605      618      +13     
- Misses         30       34       +4     
- Partials       13       14       +1     

Impacted Files	Coverage Δ
rita/modules/pluralize.py	72.22% <72.22%> (ø)
rita/parser.py	89.52% <100.00%> (ø)

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[zaibacu]

Okay, thank you! For this and previous pull request I will add documentation, tests, changelog entries etc. and hopefully can release it today ;)