change dependencies for nltk and en_core_web_md

[charlessuresh]

To try and resolve errors that occur when publishing to pypi, I've done the following:

• changed nltk dependency from url install to normal install
• removed en_core_web_md model dependency from poetry
• en_core_web_md is now downloaded in datascience_eda.py using spacy.cli

@rahulkuriyedath @lephanthuymai Please review

[codecov[bot]]

Codecov Report

Merging #41 (a1104ec) into main (ed7188f) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   98.17%   98.18%   +0.01%     
==========================================
  Files           3        3              
  Lines         656      661       +5     
==========================================
+ Hits          644      649       +5     
  Misses         12       12              

Flag	Coverage Δ
unittests	98.18% <100.00%> (+0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datascience_eda/__init__.py	100.00% <100.00%> (ø)
datascience_eda/datascience_eda.py	97.17% <100.00%> (+0.03%)	:arrow_up:

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