Update README.md

README.md

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 ### Preprocessing
 
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+
+|                         Objective                      |   Package    |
+|+------------------------------------------------------+|+------------+|
+| Resolve contractions and slang usage in text           | contractions(https://pypi.org/project/contractions/) |
+| Natural Language Processing                            | nltk(https://pypi.org/project/nltk/)         |
+
+
   |                         Objective                      |   Package    |
   |+------------------------------------------------------+|+------------+|
   | Resolve contractions and slang usage in text           | contractions(https://pypi.org/project/contractions/) |